The file 'Customizable Circular Washer 3D Printer Model' is (scad,stl) file type, size is 142.0KB.
Could be used for anything - just keep the inner diameter variable smaller than the big one if you customise it.
There are a range of washers as examples, pre-packaged at:
D = 20,
d = 7,
At various depths - referenced in the file names in millimetres.
Enjoy.
Washer_for_Blinds.scad | 1.1KB | |
Washer_for_Blinds1.5mm.stl | 281.1KB | |
Washer_for_Blinds1mm.stl | 276.4KB | |
Washer_for_Blinds2.5mm.stl | 281.1KB | |
Washer_for_Blinds2mm.stl | 267.0KB | |
Washer_for_Blinds_Various.stl | 312.6KB |