A 60mm to 50mm fan adapter meant to be used inside a 3D printer's power supply. It features a low profile so the fan can fit in the tight space inside the PSU. It should work with standard fan dimensions.
The mounting holes for the 60mm fan are 4.5mm in diameter.
The mounting holes for the 50mm fan are 4mm in diameter.
There are two versions. One with a protective grill and one without. It also features a thin channel to route the fan cables.
It is recommended that you print this in a material more tolerant to heat, like ABS or PETG.