Universal Push-On Lens Cap

thingiverse

A basic, easy to print, push-on lens cap, which can be adapted to pretty much any camera lens (or other cylindrical objects i suppose) without altering the file or having to do any math. The inner diameter of the cap is 100mm by default, which means if you need a cap for a lens with an outside diameter of 75mm for example, you just scale the print to 75% (x, y and z) in your slicer. If for some reason you need an extra deep or shallow cap, the inner depth is 10mm by default, so if you need a 6mm deep cap for example, set the scale for just the z axis to 60%. I find adding 0.2mm to the lens diameter gives a good snug fit, but obviously that may not work for your printer and filament. Set the number of outer layers high enough to avoid any infill for best results.