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Prometheus Hot End

New Customizable All-Metal Hot End for 3D Printers!

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Prometheus Hot End

Prometheus Hot End

Prometheus Hot End

Prometheus Hot End

Prometheus Hot End

New Customizable All-Metal Hot End for 3D Printers!

New Customizable All-Metal Hot End for 3D Printers!

New Customizable All-Metal Hot End for 3D Printers!

New Customizable All-Metal Hot End for 3D Printers!

Eric Sammut
Eric Sammut
Eric Sammut
Eric Sammut
1 Campaign |
Toronto, Canada
$7,650 USD 139 backers
254% of $3,000 Flexible Goal Flexible Goal

You can now pre-order at www.dta-labs.com!

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Check out these publications!

3D Hacker 3D Printer World

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FAQ:

Q: Do you offer 24V fans and heaters?

A: I can only offer 12V electronics at this time.

Q: Is Prometheus offered fully assembled?

A: All of the Prometheus Hot End perks require assembly. Kit assembly requires basic soldering skills. 

Q: Do you offer a heat sink with bowden integration?

A: Update: All Prometheus Hot Ends can be used in both standard or bowden setups. If you want to use Prometheus in a bowden setup then simply select a bowden coupler and required tubing perks along with your Prometheus Hot End perk!

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Summary

This new hot end design allows RepRap users to experiment with all aspects of thermoplastic extrusion. Its actively cooled all-metal construction is very durable and can easily withstand the high temperatures required for extruding thermoplastics like Nylon and Polycarbonate, while its unique modular design enables the user to customize the "melt-zone" length, “transition-zone" length, and thermistor position according to their needs.

This compact, reliable, and precise hot end is the all-in-one solution for your 3D printer!


Design Features

  • Durable, actively cooled, all-metal construction for high-temperature extrusion up to 300C.
  • Modular design with user-variable "melt-zone" length, "transition-zone" length, and thermistor position for your specific need or experimentation.
  • Precision CNC-machined parts featuring a 1-Piece Stainless Steel Nozzle that is internally polished to prevent jamming (especially when printing PLA).
  • 1-Piece Stainless Steel Nozzle eliminates all leaks and clogs caused by internal "melt-zone" junctions.
  • Thermistor is now secured by a cap screw for increased reliability and aesthetic appeal. No more messy Kapton Tape wrapped around the heater block.
  • Support for an additional “redundant” heater block thermistor as an optional precautionary measure.
  • Compact design conserves z-height and easily fits standard extruder bodies.

  • Customizable design makes it very easy to adjust the nozzle height for dual extrusion setups.

  • Assembled weight is only about 30g making it ideal for high-speed printing on Delta and “Ultimaker-style” 3D printers.
  • Printed successfully for hundreds of hours with PLA, ABS, Polycarbonate, and Nylon 618.
  • Number of hot end leaks, clogs, and jams experienced during testing: 0 (zero!).

*Select your perk on the right and help make the Prometheus Hot End a reality!


Testing

To ensure reliable precise performance the Prometheus Hot End has been tested extensively. Prometheus has printed successfully for hundreds of hours in PLA, ABS, Polycarbonate, and Nylon on several Prusa I2 printers without any leaks, clogs, or jams. All testing was done with a 16mm “melt-zone” length and 2-3mm “transition-zone” length.

I have tested the Prometheus Hot End with various high stress printing scenarios without any issues: I have printed PLA at very low extrusion rates for long periods of time; I have printed Polycarbonate at 300C above a 140C heat bed in an enclosed print chamber; I have tested rapid successive retractions and 10+ hour long prints. 

I have also tested the Prometheus Hot End with the lowest quality PLA on the market. I had an old roll of neon green ESUN PLA that had been left in an uncontrolled environment throughout a very hot and humid summer in Toronto. It was wavy and swollen yet I still managed to print a decent looking Yoda head and Bhudda bust at 100 microns without any issues!

In addition to its admirable reliability, Prometheus has demonstrated great precision in the prints that it produces. I have managed to print down to 50 microns on my wobbly Prusa I2 printers! Most of my test objects were printed at 100 microns with amazing results that easily match objects I printed with my E3D hot end. 

YouTube: On my YouTube Channel you can watch several videos of the Prometheus Hot End printing PLA, ABS, Polycarbonate, and Nylon 618. Below you can watch a short video of Prometheus printing a Zig-Zag Vase in Nylon 618 at 200 microns (sorry for the poor audio quality):

Flickr: On my Flickr Photostream you can view over 300 pictures of objects that Prometheus has printed. The pictures below are a few examples of objects I have printed with Prometheus.

*Keep in mind that ALL of these objects were printed on my wobbly old Prusa I2 printers. If I can get these results on my old printers, just imagine how well Prometheus will perform on a rigid Prusa I3, Mendel 90, or Solidoodle!


Introduction

Hey Guys! My name is Eric (user “RP Iron Man” on the RepRap forums) and I have been actively involved in the RepRap community for over a year. Before I became involved in entrepreneurial work, I worked at a staging company where I did Carpentry, Welding, CAD Design, CAM, CNC Programming, and Industrial CNC Operation. I also did significant Project Management on $8000 projects for real world clients with tight deadlines. Eventually I quite this job and started to focus on turning my RepRap hobby into a business. I took an immediate interest in hot end design as I saw the need for many improvements. 

As our 3D printing community continues to explore new boundaries, exciting high-temperature plastics like Polycarbonate and Nylon are becoming widely available. As a result, RepRappers are replacing their old PEEK insulated J-Heads with new all-metal hot ends that are capable of printing at these high-temperatures. With a plethora of new hot end designs, all-metal hot ends are becoming the ubiquitous all-in-one solution for RepRap 3D printers around the world.

Despite these recent innovations, I have noticed that the new all-metal hot ends have the same static design features of a fixed "melt-zone", "transition-zone", and thermistor position. While these new designs satisfy the need for reliable high-temperature extrusion, they seem to ignore the fact that users may require different hot end parameters for their specific needs or simply for experimentation.

It didn't seem like anyone else had solved this problem yet so I decided that I would take on this project. Finally, after months of designing, three generations of prototypes, and hundreds of hours of printing, the Prometheus Hot End was born!


Modular Design

The modular design of the Prometheus Hot End consists of three custom designed and precision CNC-machined components: the Aluminium Heat Sink, the Aluminium Heater Block, and the 1-Piece Stainless Steel Nozzle. Every component of the Prometheus Hot End was carefully engineered for optimum performance.


Aluminium Heat Sink

The Aluminium Heat Sink is precision CNC-machined and polished for a beautiful surface finish. Aluminium was chosen as the material for the heat sink due to its high thermal conductivity and high machinability. The heat sink incorporates a standard groove mount design for compatibility with standard extruder bodies. Fins are turned into the heat sink to maximize cooling and symmetrical faces are milled on each side to allow a 25mm cooling fan to be mounted directly to the heat sink. This design feature eliminates the plastic fan duct, decreases mass, and increases cooling efficiency.

The heat sink is also threaded from top to bottom to allow the 1-Piece Stainless Steel Nozzle to be threaded into the heat sink and fastened at the bottom with an aluminium hex nut. A PTFE tube is inserted from the top and meets with the nozzle in the threaded portion of the heat sink to facilitate a low friction filament path into the nozzle.

*Note: This PTFE tube is inserted in the “cold-zone” of the hot end in the actively-cooled heat sink so it is NOT subjected to high temperatures.


Aluminium Heater Block

The Aluminium Heater Block is precision CNC-machined and polished for a beautiful surface finish. Aluminium was also chosen as the material for the heater block due to its high thermal conductivity and high machinability. The Aluminium Heater Block is simply designed with a 5.5mm hole for the heater, two thermistor mounting holes, an M6 thread, and a top-to-bottom threaded hole for the 1-Piece Stainless Steel Nozzle. The nozzle is threaded through the top and secured with an aluminium hex nut. Additional aluminium hex nuts can be fastened against the heater block to customize the “melt-zone” length. 

The heater is a 12V 30W through-hole resistor heater and the thermistor is a Semitec 100K glass bead thermistor which measures up to 300C. The heater block features an additional thermistor hole which is useful if you want to add a second “redundant” thermistor for added reliability. Note that the heater block pictured above has been slightly revised according to the technical drawings below so both thermistor holes are sized to fit the Semitec 100K glass bead thermistor. 

I have recently made some slight adjustments to the heater block in order to improve a few details of the design. I think the most important improvement is that the thermistor will no longer be secured to the heater block by Kapton Tape. Wrapping Kapton Tape around the heater block is a messy, unreliable, and unattractive way to secure the thermistor so I really wanted to do away with this approach.

While discussing this with a few people on the forum, Brian (RepRap user “bstott”) suggested this method to secure the thermistor leads. As illustrated in the technical drawing above, a cap screw with a small OD washer secures the thermistor leads and eliminates the possibility of the thermistor falling out. This is a significant improvement to both the reliability of the thermistor and the aesthetic appeal of the hot end. The M6 threaded hole also allows for a future upgrade to standard M6 threaded thermocouples. All hot end perks will ship with this improved heater block design.


1-Piece Stainless Steel Nozzle

The 1-Piece Stainless Steel Nozzle is precision CNC-machined and polished for a beautiful surface finish. Stainless Steel was chosen as the material for the 1-piece nozzle due to its low thermal conductivity, low thermal expansion, and high strength. This design replaces the standard nozzle and heat break combination in most all-metal hot end designs with a 1-piece nozzle that eliminates all internal "melt-zone" junctions.

Internal "melt-zone" junctions are the leading cause of leaks and clogs in conventional hot end designs. Molten plastic can leak through the junction or can get stuck in the junction, decompose, and the charred remains can then flow down and clog the nozzle orifice. I have experienced these problems even with the best hot end designs. With my 1-piece nozzle/heat-break design I have completely eliminated all internal “melt-zone” junctions and thus eliminated the possibility of "melt-zone" related leaking or clogging. With several hundred hours of printing and not a single leak or clog, the empirical results speak for themselves.

In addition to the 1-piece design, I was meticulous about custom burnishing the internal pathway of the nozzle to avoid the possibility of the filament jamming. Filament jamming is the most significant problem associated with all-metal hot ends. While hot end “clogging” relates to the obstruction of the nozzle orifice, hot end “jamming” is associated with the forces involved in filament extrusion. In order to extrude filament successfully, the applied force of the extruder drive must be greater than the opposing force of friction.

Friction occurs most prominently in the “transition-zone” of the hot end where the plastic is changing from solid, to rubbery, to liquid. The plastic remains solid in the "cold-zone" until it is heated above its Glass Transition Temperature (Tg) in the "transition-zone" at which point it is "rubbery" until it is heated above its Melting Temperature (Tm) and turns to liquid in the "melt-zone". In its “rubbery” state at temperatures between Tg and Tm, the plastic turns soft and expands to form a plug in the “transition-zone”. This plug of soft rubbery plastic is the most significant source of friction in the hot end and is the leading cause of hot end jams.

The standard J-Head hot end design features a low friction PTFE liner that extends the full length of the “transition-zone” and greatly reduces the friction caused by this plug. However, all-metal hot ends do not have a PTFE lined “transition-zone” so friction becomes a significant issue especially when printing PLA. To overcome this problem I custom burnished the full length of the internal bore of the nozzle. The burnishing procedure polishes the internal pathway of the nozzle to a near mirror finish ensuring that it is smooth enough to eliminate jamming.


Customizing the “Melt-Zone”, “Transition-Zone”, and Thermistor Position

Introducing the "melt-zone" length, "transition-zone" length, and thermistor position as fully customizable variables is what makes the Prometheus Hot End truly unique. The "melt-zone" and "transition-zone" length are two of the most significant design features of a hot end which govern the extrusion behavior while the position of the thermistor greatly influences the thermal control of the "melt-zone". In conventional hot ends these design features remain fixed and are optimized for a specific need, which allows for very little flexibility and experimentation. The Prometheus Hot End was designed specifically as a flexible platform that would enable RepRap users to experiment with the effects of different "melt-zone", "transition-zone", and thermistor configurations on the extrusion behavior.

The Prometheus Hot End was purposely designed so that these three parameters could be adjusted as easily as possible. The “melt-zone” can be lengthened simply by threading additional aluminium hex nuts against the heater block. As a result, the position of the thermistor in the “melt-zone” is user-customizable based on how you position the heater block and additional hex nuts on the nozzle. The “transition-zone” is easily set by increasing the distance between the heat sink and the heater block.

The pictures below illustrate various "melt-zone", "transition-zone", and thermistor configurations that are possible with the Prometheus Hot End.

CZ = "Cold-Zone" Length

TZ = "Transition-Zone" Length

MZ = "Melt-Zone" Length

TP = Thermistor Position


Advantages of a Customizable Design

The "melt-zone" length, “transition-zone" length, and thermistor position are three key parameters that govern hot end performance so enabling user-customization of these features has some important implications. While this customizable hot end design allows for some interesting experimentation, it also allows each user to customize the performance of the hot end according to their specific needs.

The “transition-zone": Enabling a customizable “transition-zone" length allows the user to set a very short (2mm-3mm) “transition-zone" to increase the reliability and extrusion response of the hot end. The length of the “transition-zone" governs the length of the soft rubbery “transition-zone" plug which is the most significant source of friction in the hot end and is the leading cause of hot end jams. This plug also increases hysteresis (slower extrusion response time) when extruding at very low flow rates. Configuring a short “transition-zone" decreases the length of this plug and therefore increases reliability and extrusion response of the hot end.

The melt-zone": Having a user-customizable "melt-zone" is arguably the most significant advantage of this customizable design since the requirements for "melt-zone" length vary considerably between applications. The length of the "melt-zone" determines the volume of molten plastic in the hot end and therefore is responsible for the amount of “ooze”, extrusion response, retraction response, and maximum feed rate of the hot end. A shorter "melt-zone" means less molten plastic in the hot end and results in less “ooze”, faster extrusion response, and more effective retractions at the expense of a lower maximum feed rate. A longer "melt-zone" means more molten plastic in the hot end and results in a higher maximum feed rate at the expense of more “ooze”, slower extrusion response, and less effective retractions. Consequently, a short "melt-zone" would be ideal for printing detailed objects at lower extrusion rates, while a longer "melt-zone" would be the better configuration for high speed printing.

The thermistor position: Customizing the position of the thermistor in the "melt-zone" is also a useful feature of this flexible hot end design. The thermistor position determines the accuracy of the temperature reading and the thermal response of the hot end. Generally, there are a few causes of heat loss in the "melt-zone": heat loss due to thermal radiation of the aluminium parts, heat loss through the “transition-zone” to the actively cooled “cold-zone”, heat used to melt the plastic entering the "melt-zone", and heat transferred to the extruded plastic at the nozzle tip. Most of the heat is dissipated at the top of the "melt-zone" so it is a good idea to configure the thermistor position at the top of the "melt-zone" to ensure that the temperature is sustained especially at high feed rates. However, if you are printing very detailed items at low feed rates and you are more concerned with very accurate temperature readings at the nozzle tip you may want to configure the thermistor position at the bottom of the "melt-zone". In either case, the entire "melt-zone" is aluminium (highly thermally conductive) so the thermal hysteresis within the "melt-zone" is not much of an issue at all. 


Performance Expectations

Throughout my testing, the Prometheus Hot End has performed very reliability and has demonstrated admirable precision in the prints that it has produced. However, note that my testing results may not reflect the performance of this hot end in every possible 3D printer configuration considering the differences in each printer setup.

While I am confident that this hot end will meet all of your expectations I would like to remind everyone that this new design (like most all-metal hot ends) is still considered “experimental” so at this point I cannot yet guarantee any performance standard.


Open-Source Design

Of course, I could not have created the Prometheus Hot End without the help the RepRap community. Browsing the RepRap wiki, reading RepRap forum threads, and discussing various hot end designs with other forum members has taught me so much about the intricacies of hot end engineering.

I hope that I can help refuel innovation within RepRap by making the technical drawings of the Prometheus Hot End available to everyone. I am releasing the Prometheus Hot End design under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License (CC BY-NC-SA 3.0). The drawings are available here on my Flickr Photostream so feel free to check them out!

Recently we have also been having some detailed discussions about the design features of this hot end on the RepRap Fourms so if you are interested in reading into this you can check out this thread.


Why Indiegogo?

In order to mass produce the Prometheus Hot End at a reasonable price, there are Minimum Order Quantities (MOQ) that must be met. I can make small orders with my own savings but in order to have the components mass produced efficiently I need to meet the MOQ of my suppliers. Soon after this campaign begins, I am going to make the initial Early Bird order from my suppliers for the Prometheus Early Bird kits to ensure that I can have the Early Bird kits shipped out on time. Your support will help me meet (and hopefully far surpass!) the requirements to begin mass production. Your help will also fund my future developments. I have many projects that I have on hold and your support will help bring these future projects to life!


Perks

Once the Campaign is complete all contributors will be listed in a thank you post on my website for supporting this project! My website should be up in a few weeks.

This is will give you a general idea of what is included in the Prometheus Hot End kit perks:

Both the 1.75mm and 3mm Prometheus Hot End perks ship with a 0.4mm nozzle orifice. I hope to start testing different nozzle orifice sizes once this campaign in complete.

Please note that the Prometheus Hot End is currently designed for direct drive extruders and I don't have an integrated bowden version available yet. However, you can easily design a plastic bowden coupling adapter to use Prometheus with your bowden extruder. Weighing just 30g, the Prometheus Hot End is ideal for high speed printing on a bowden 3d printer!

Help support this project by selecting the perk that you want. Worldwide shipping is included in the price of each perk and if you select a Groove Mount Plate as an add-on it will ship with your Prometheus (1.75mm or 3mm) perk.

The Prometheus Early Bird perks are priced lower and ship earlier than the standard perks. If you want to get your Prometheus Hot End early be sure to select this perk. The quantity of Early Bird perks available is limited so don't wait!

Note that the standard perks will be shipped in the order they are received so be sure to order earlier to receive your perk sooner. Once this campaign is finished the Prometheus Hot End kits will be available at a slightly higher price on my website. I encourage everyone to take advantage of the discounted prices offered in this campaign!

The payment method is PayPal, which is of course a very safe way to pay!


Timeline

April 2014 ----------

- Launch Indiegogo campaign.

- Make first order for Early Bird perks from suppliers.

May 2014 ----------

- Early Bird production in progress.

June 2014 ----------

- Campaign ends.

- Make second order for standard perks from suppliers.

- Ship all Early Bird perks.

July 2014 ----------

- Standard production in progress.

- Ship all standard perks in the order they are received.


Risks

There are always risks associated with scaling a product from prototype to mass production. In order to minimize these risks, I have split the production plan into two stages: Early Bird production and standard production. The Early Bird production run will commence soon after the campaign begins and will be completed before the standard production starts. In the unlikely case that there is a defect in product quality it will be detected in the Early Bird production stage. This minimizes the risk and allows me enough time to make corrections in the event that something does go wrong. This precautionary measure will help support the success of this project under any circumstances.

To ensure that I can effectively carry out this project, I have dedicated a lot of time to finding reliable suppliers. I have assured the quality of all of the products and I have selected backup suppliers as an additional precautionary measure. I have worked with my suppliers for a long time and we have a very good relationship. I am confident that the quality of the parts will be top-notch. In addition, my suppliers have a very large manufacturing facility so scaling up production to meet increased demand should not be an issue.


Fulfillment

Design engineering, prototyping, and testing are just the first few stages of the project. The perk fulfillment is as important as any stage of the project and requires just as much forethought. The project timeline I listed above should give me more than enough time to fulfill the perks. I deliberately exaggerated the shipping date in case I encounter any delays with production. Based on my planning, I firmly believe that I will be able to meet the dates on the fulfillment timeline. However, note that there is always a possibility that the perks will be shipped later than the assigned date.

I will be sure to keep you informed with regular updates from the start of the campaign to perk delivery!


Other Ways You Can Help

Even if you can't afford to fund my project you can still help! Tell all of your 3D printer buddies about the new Prometheus Hot End and get the word out! Use the Indiegogo share tools and do anything you can to increase publicity. Unfortunately, I am not much of a marketing guy and I don't have many resources for marketing this project so every little bit of publicity will help make this project a reality.

Thank you so much for your support!

Happy printing :)

Looking for more information? Check the project FAQ
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Choose your Perk

One Bowden Coupler

$3 USD
One Bowden Coupler for your Prometheus Hot End. You will receive: - 1x Modified bowden coupler for your Prometheus Hot End Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
12 claimed

750mm Bowden Tube (1.75mm)

$5 USD
750mm Bowden Tube for 1.75mm Filament. You will receive: - 750mm Bowden Tube for 1.75mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
5 claimed

Two Bowden Couplers

$6 USD
Two Bowden Couplers for your Prometheus Hot End. You will receive: - 2x Modified bowden couplers for your Prometheus Hot End Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
18 claimed

1000mm Bowden Tube (1.75mm)

$6 USD
1000mm Bowden Tube for 1.75mm Filament. You will receive: - 1000mm Bowden Tube for 1.75mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
4 claimed

1250mm Bowden Tube (1.75mm)

$8 USD
1250mm Bowden Tube for 1.75mm Filament. You will receive: - 1250mm Bowden Tube for 1.75mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
0 claimed

1500mm Bowden Tube (1.75mm)

$9 USD
1500mm Bowden Tube for 1.75mm Filament. You will receive: - 1500mm Bowden Tube for 1.75mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
8 claimed

750mm Bowden Tube (3mm)

$10 USD
750mm Bowden Tube for 3mm Filament. You will receive: - 750mm Bowden Tube for 3mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
0 claimed

1000mm Bowden Tube (3mm)

$13 USD
1000mm Bowden Tube for 3mm Filament. You will receive: - 1000mm Bowden Tube for 3mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
0 claimed

1250mm Bowden Tube (3mm)

$16 USD
1250mm Bowden Tube for 3mm Filament. You will receive: - 1250mm Bowden Tube for 3mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
0 claimed

1500mm Bowden Tube (3mm)

$20 USD
1500mm Bowden Tube for 3mm Filament. You will receive: - 1500mm Bowden Tube for 3mm Filament. Note* This is an add on for the Prometheus Hot End perks and will ship with the perk that you selected.
Estimated Shipping
July 2014
0 claimed

Prometheus 1.75mm

$79 USD
Prometheus Hot End kit for 1.75mm filament. You will receive: - 1x Set of CNC Machined Parts - 8x M4 Aluminium Hex Nut - 1x Resistor Heater - 1x Cooling Fan - 1x 100K Thermistor - 1x PTFE Insert - 1x Wire Set - 1x Hardware Set - Dean Connectors - 1x Kapton Tape Strip - 1x Aluminium Foil Strip Worldwide shipping included Note* Basic soldering skills required for kit assembly.
Estimated Shipping
July 2014
9 claimed

Prometheus 3mm

$79 USD
Prometheus Hot End kit for 3mm filament You will receive: - 1x Set of CNC Machined Parts - 8x M5 Aluminium Hex Nut - 1x Resistor Heater - 1x Cooling Fan - 1x 100K Thermistor - 1x PTFE Insert - 1x Wire Set - 1x Hardware Set - Dean Connectors - 1x Kapton Tape Strip - 1x Aluminium Foil Strip Worldwide shipping included Note* Basic soldering skills required for kit assembly.
Estimated Shipping
July 2014
3 claimed

DUAL Prometheus 1.75mm

$149 USD
DUAL Prometheus Hot End kit for 1.75mm filament. You will receive: - 2x Prometheus 1.75mm Kit Worldwide shipping included Note* Basic soldering skills required for kit assembly.
Estimated Shipping
July 2014
6 claimed

DUAL Prometheus 3mm

$149 USD
DUAL Prometheus Hot End kit for 3mm filament. You will receive: - 2x Prometheus 3mm Kit Worldwide shipping included Note* Basic soldering skills required for kit assembly.
Estimated Shipping
July 2014
0 claimed

Original Prometheus VIP Pass

$1,000 USD
You are my new best friend! You are invited to come to Toronto, ON Canada to check out my makeshift lab where all of the magic happens :D I will buy you lunch, or dinner...or both! We can talk about RepRap, 3D printing, or anything you want to talk about! I will also give you the first ever Prometheus Hot End prototype! This prototype has printed flawlessly for hundreds of hours and has great sentimental value :) Note* Travel expenses to Toronto, ON Canada not provided.
Estimated Shipping
June 2014
0 out of 1 of claimed
sold out

Prometheus 1.75mm Early Bird

$74 USD
Estimated Shipping
June 2014
45 out of 45 of claimed
sold out

Prometheus 3mm Early Bird

$74 USD
Estimated Shipping
June 2014
28 out of 28 of claimed

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