M42 mount to Canon EF
thingiverse
I remixed the original M42 adapter to fit better on the Helios 44M-2 and the 44M-5 I had, fixed the lens orientation and made the radius bigger so the two holes can fit better.
Download Model from thingiverse
With this file you will be able to print M42 mount to Canon EF 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 M42 mount to Canon EF.