The file '3mm. Thumbnut PETG 3D Printer Model' is (stl) file type, size is 82.1KB.
If you want to use the PSU holder for the PRUSA mini enclosure from their printables site:
https://www.printables.com/model/936064-prusa-mini-enclosure-psu-mounts
but do not have the filteroption with the necessary thumb nuts, here's a 3D print version of the nuts that work real good.
Print three of these with the widest part down on the plate, no supports nor brim necessary.
thumbscrew3_mm.stl | 233.9KB |