Original Prusa i3 MK2 Alternate Part Cooling Nozzle

thingiverse

An alternate part cooling nozzle I designed for my Prusa Original i3 MK2, hopefully to improve part cooling performance on the back-side of parts. It is currently mounted on my printer, but I have not yet completed enough testing to determine if it really is an improvement, or by how much. Please let me know in the comments how it works for you and I will continue to refine the design. In order to mount this nozzle, you also require a modified extruder cover, which is listed here: http://www.thingiverse.com/thing:2187094 Sorry, I couldn't list both objects together, as that cover is based on Prusa code and carries the GPL, but I wanted to list my part under a non-commercial license. If you would like to license my design for commercial purposes, please contact me. Update March 27 2017 : Updated model with a variety of small tweaks. Update April 13 2017 : Further tweaks to the design. Increased clearance around heat-block should reduce warping of nozzle. Modified internal air path. Tweaked nut-trap diameters should hold nuts better. Update September 22 2017 : Just very minor tweaks this time around - mostly cosmetic or to make printing a bit easier. If you've already got the previous version installed on your printer I would't bother "upgrading". And with this, and all the feedback I've received, I'm finally marking the design as complete. Thanks go to Spoegler-Engineering, who designed this Titan Extruder upgrade kit for the MK2: http://www.thingiverse.com/thing:2065461 - that was the inspiration behind this design. Print Settings Printer: Original Prusa i3 MK2 Rafts: No Supports: No Resolution: .2 mm Infill: 20% Notes: There is a single built-in support under the right side - it can be cut off with a sharp knife after printing. Or if you prefer, remove it in software and use your slicer supports - just be careful not to let it fill up the interior with support material. Remember to print it out of a heat-resistant material, as it is very close to the heat-block. As this nozzle sits closer to the heat-block than any stock Prusa parts do, I recommend a minimum of ABS in terms of heat-resistance. Development versions of this cooler in PETG have all suffered significant warping and heat damage - you might get away with a PETG one if you only print PLA as it does cool itself from the inside so long as the part-cooling fan is running, but a PETG one will be damaged after running an ABS print involving higher temperatures and little to no airflow. I've not personally done any testing to determine how much having an E3D sock may protect the nozzle from radiated heat.