Ultimaker Stepper Motor Cooling Shroud
thingiverse
To combat overheating Ultimaker stepper motors, print three cooling shrouds that slide easily onto the X, Y, or extruder steppers without removing them (assuming wires are in place). Fasten small #4 bolts through each shroud's five holes and mount fans to draw air out. Wire the fans to the controller board LED output (19V) or fan output (also 19V), using a combination of 5V, 24V fans, or one 24V and two 12V fans in series-parallel. Secure shrouds with a small bolt for a tighter fit if desired, and guide motor wires through semi-circular holes. For the Y-axis stepper, rotate it in due to limited clearance and connect triangular tabs on the shroud's back part to the stepper's bevel. No need for large fans; a little airflow will maintain the steppers under body temperature.
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