50mm to 40mm fan adaptor

thingiverse

An adapter for reducing a 50mm fan to fit a 40mm space is provided, although the mount holes might need slight drilling adjustments. The design should function well for its purpose. However, an update has been made to the file, as the bolts were originally too close. Note that this new version requires supports or a fan for proper printing. The model was created in SketchUp and exported as STL; it has been tested with Slic3r and Kisslicer software.