Additional Cooling Fan Mount for Prusa i3 Mk2 (40x40mm)

thingiverse

Update 6/4/2017: Be aware that this early design may break over time due to vibration. I'll try to improve my design and print settings, making it more durable. Look out for updates. This mount allows you to add an additional fan (40x40x10mm) to your Prusa i3 Mk2 as a way to cool the print from multiple directions. The mount can be installed with minimal alterations to your printer since it's designed to use existing mounting holes in the original Mk2 extruder and is secured with two M3x20mm screws from the spare parts included in the kit version. All you need to buy are the 40x40mm fan itself and the necessary wiring. Print Settings Printer Brand: Prusa Printer: Prusa Mk2 Rafts: No Supports: No Resolution: 0.15mm (150 microns) Infill: 10% Honeycomb I recommend printing with the cooling fan enabled, even when printing in ABS. For this part, print quality is more important than strength. I used 50% cooling fan and 100% when bridging (I also used an enclosure; you may need to try a few settings). Post-Printing Temporarily remove the original 30x30mm fan and keep the 4x M3x18 screws handy. Route the cables as needed, then reinstall the 30x30mm fan with two M3x18 screws at the top and two M3x20 screws through both the mount and the 30x30mm fan at the bottom. Then install the 40x40mm fan to the mount using the leftover 2x M3x18 screws. Hook up both the original part cooler and the new 40x40mm fan to the "Fan 2" pin on the electronics board. Step 1: Remove the 30x30mm fan and keep the 4x M3x18 screws nearby, as you'll need them soon. Step 2: Route the cable for the 40x40mm fan through the same slot as the extruder stepper motor's cable. This might be a bit tricky, so feel free to route it differently if needed. Step 3: Reattach the 30x30mm fan with two M3x18 screws at the top and two M3x20 screws (from the spare parts) at the bottom through the fan mount. Step 4: Attach the 40x40mm fan to the mount using the leftover 2x M3x18 screws. Step 5: Wiring - Not detailed here. Connect the fan to the "Fan 2" output on the Mini RAMBo (the electronics board). You'll need to create some wiring so that you can connect both the additional 40x40mm fan and the original part cooler fan to the same "Fan 2" output. There are many ways to do this, and I won't be able to show you the best method with the tools you have on hand. You could use a breadboard and "dupont" style jumper cables if you just want to test if this fan mount meets your expectations, but I wouldn't recommend it as a permanent solution. How I Designed This I imported the original .STL files for the Prusa Mk2 extruder in Tinkercad and modeled my design around them, ensuring that it would fit the printer. I designed everything myself, except for the holes that mount onto the 30x30mm fan; those were copied from the original .STL files so they would line up with the extrudes holes. My Tinkercad design is public and available here: https://www.tinkercad.com/things/jNhzmBhRBg9-additional-part-cooling-fan-for-prusa-i3-mk2