Prusa i3 MK2/S Adaptor for 40mm Silent Fan

Minimal design for a silent hot-end fan:

• Smaller 40mm fan base and re-enforcement for screws.
• Maximize air flow for cooling - No grill and adapter air outlet matches E3D air inlet.
• Thicker base for better Prusa mount.
• Fits Original Prusa i3 MK2 and MK2S.

For assembly you will need four M3 10mm screws for the 40mm fan and four M3 10 or 12mm screws. See photos.

I use the 40mm fan SILENT 4 as it is quiet and moves enough air for cooling (eBay USD $10). The best solution is still the fan from Noctura, but at a higher price tag. Both the 10mm and the 20mm Noctura fan will fit the adapter without collision.

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Print instructions

Layer: 0.20mm
Infill: 25% Rectlinear

2 perimeters, 4 top 3 bottom layers.

The part on photos is printed in Prusa Orange EasyABS and vapor smoothed to give low air friction in duct. Part can also be printed in ASA, PLA or PETG.

Printing in ABS, I had to turn on part fan for the top 10-15mm to get best result (lowest setting).