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
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Metal "MB" HotEnd for 1.75mm filament by rp_one_labs is licensed under the GNU - GPL license.

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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".

Finally, as of Dec 2014, this hotend with improvements (PTFE lined barrel and fan with shroud) is available for purchase here


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.

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How does this hotend compare with your MG Plus? I'm looking for the best one for printing PLA.


Dec 12, 2014 - Modified Dec 12, 2014

I see it's available now. Is there an extruder or X axis mount that I can print prior to ordering one? I'm thinking with a bowden extruder that this would be amazing on my i3.

Hi, mounting options are the same as for budachnozzle. Wade's extruder should work with it. I don't have yet printable parts for bowden solution for prusa i3, but I was palnning to make few designs to make it easier to adopt it.

a groovemount bowden adapter

Are these still in production?

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.

This looks great! Looking forward to availability.

Any news about availability?

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

Thanks for the fast reply.

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

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

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

check out my solution. http://www.reprap.org/wiki/Yegahhttp://www.reprap.org/wiki/Yeg... and http://www.thingiverse.com/thing:76135http://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.

golemD Xcart prototype
by yru

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.

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.

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.

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

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

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

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.

This is nice. I'm very interested in this nozzle type. It is super short! Do you plan a 3mm version?

Yes I do, but I cannot tell exactly when it will be ready.

i too am interested in th 3mm one

i too am interested in th 3mm one

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