120mm fan flange for 150mm hole

An adapter to mount a 120mm fan on to a 150mm hole, with a brim for gluing it down. A version with screw holes is also supplied.

The holes for the 120mm fan mount are sized (6.3mm diameter) to take typical threaded inserts for M5 screws, which can be pushed in with a soldering iron. Increase the number of perimeters to 3 or 4 to add strength.

Probably best printed in PETG (130g with 4 perimeters and 15% infill).