Customizeable Lens Cap
thingiverse
The defaults for this are for a 56mm lens (I used it for a Nikon DX 55-200mm lens). Use the customizer tab in openscad to change it to suit your needs. It is just a slip fit, no latches, so if you make it the correct size (don't forget you can use decimals) it should fit just about any lens (or anything else you want to cap as well).
Download Model from thingiverse
With this file you will be able to print Customizeable Lens Cap with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Customizeable Lens Cap.