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Metal "MB" HotEnd for 1.75mm filament

by rp_one_labs, published

Metal "MB" HotEnd for 1.75mm filament by rp_one_labs Apr 18, 2013

Description

This thingy made of brass nozzle, stainless barrel (also called thermal barrier), aluminum heater block, aluminum heatsink and aluminum mount plate. Heating element is 6mm x 23mm 40 Watt heater cartridge. Thermistor is pre-glued with GB Weld inside brass hex M-F M3 stud, thermistor is equipped with JST connector. Thingy can be assembled or taken apart in one minute without glue or kapton tape. Everything is screw on-off.

Based on Makerbot Stepstruder Mk7 hotend. Nozzle has Makerbot's modern Mk8 geometry, 0.4mm orifice diameter, but slightly larger than Mk8 outer hex size (7.9mm instead of 6.5mm because it was machined in USA from inch size stock). SS thermal barrier also similar to one used in Stepstruder. Part of the credit goes to Makerbot, which is why I call it "MB".

Recent Comments

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No, it is not in production. I needed to optimize production cost to make reasonably priced product, and high quality too. That effort took me as far as getting new expensive cnc equipment... but I have not got it yet... therefore this and some other projects are delayed. Hopefully not for long.

Are these still in production?

This looks great! Looking forward to availability.

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License

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If you print this Thing and display it in public proudly give attribution by printing and displaying this tag. Print Thing Tag

Instructions

This is release candidate. Details on the construction will be published when it is released. Please check out STL for 3D View and supplied PDF drawing for dimensions.

Comments

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jaeg on Jan 14, 2014 said:

Are these still in production?

rp_one_labs on Jan 14, 2014 said:

No, it is not in production. I needed to optimize production cost to make reasonably priced product, and high quality too. That effort took me as far as getting new expensive cnc equipment... but I have not got it yet... therefore this and some other projects are delayed. Hopefully not for long.

kidicarus on Jul 5, 2013 said:

This looks great! Looking forward to availability.

flurin on May 31, 2013 said:

Any news about availability?

rp_one_labs on May 31, 2013 said:

Currently I am working out issues with production. I hope it will be ready within a month.

anewsome on May 14, 2013 said:

sign me up to buy one of these when they are ready!

dreameredeemer on Apr 18, 2013 said:

I thought I recognized those heater cartridges from ebay, then I saw OP. Nice work!

rp_one_labs on Apr 18, 2013 said:

Thanks. Yes, I like those cartridges. No need for glue, long wires, easy to install or replace.

yru on Apr 18, 2013 said:

check out my solution. http://www.reprap.org/wiki/Yeg... and http://www.thingiverse.com/thi... you can use whole area of the cart as heatsing with thinner plate and the same fan for cooling extruder stepper and heatsink. this also separates mounting of hotend and extruder. just screw your hotend into 8mm dia interface and solutions are compatible. drop me a message if you want to exchange ideas further.

rp_one_labs on Apr 18, 2013 said:

Right. If you have application specific large aluminum plate, you can use it as a mount and heat sink. I will do the same. "MB" Thingy was made to be compatible with printed cold ends.

rp_one_labs on Apr 18, 2013 said:

Right. If you have application specific large aluminum plate, you can use it as a mount and heat sink. I will do the same. "MB" Thingy was made to be compatible with printed cold ends.

rp_one_labs on Apr 18, 2013 said:

Right. If you have application specific large aluminum plate, you can use it as a mount and heat sink. I will do the same. "MB" Thingy was made to be compatible with printed cold ends.

openhardwarecoza on Apr 18, 2013 said:

Are you planning on selling there - would not mind buying a sample for you

rp_one_labs on Apr 18, 2013 said:

Yes, I am planning to sell. I will let you know, and you can buy, as soon as I settle with this design.

mark314 on Apr 18, 2013 said:

What tmperature is at top of the nozzle? I also tried to design something like that but temperature in simulation was to high.

rp_one_labs on Apr 18, 2013 said:

Conditions: Room temp. 25C, nozzle temp. 240C, 40mm cheap CPU fan blowing. Measured temperatures: mount plate 28C and barrel entry 30-32C. This was running for long time showing these steady results. Measurements were taken in stationary position. Carriage movements will provide additional cooling.

rp_one_labs on Apr 18, 2013 said:

Active cooling is required for reliable operation. I will post temperature in a while.

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