Stepper Motor Cooling Shroud and Silencer

This a modification of the stepper motor cowling by boksbox. The goal was to further reduce motor noise by adding a flexible vibration damping layer between the motor and the hard cowling layer, while maintaining the space in the original design for motor cooling. The design is meant for the common 48 mm LDO NEMA 17 42STH48-2504AC “speedy power” steppers common in DIY CoreXYs with a 10 mm heatsink attached to the base.

Printing tips

Both models require supports for the cutout around the JST connector. PrusaSlicer will usually try to generate supports for the screw clamp but it is unnecessary assuming your printer has decent part cooling. The outer layer requires supports for the fan port on the bottom.

These model is actually an excellent use case for the new organic supports in the new PrusaSlicer version. They remove very easily compared to standard supports.

The model shown is printed in Atomic Filament Dark Blue CF PETG for the outer layer and Inland rainbow TPU for the inner layer. I used a pair of Noctua NF-A4x20 4020 fans in pull configuration and they work quite well. They're quiet and still move a decent amount of air. The decouplers also pictured in the images are from DJ_Designs here.