About this 3D model

Summary Thanks to the linked makers I was able to merge them and to create this EF to M42 lens adapter. It works well for me but it is possible to improve it. If you printed the design you have to drill a hole at the spot where a camera lens holder Pin is, else your converted lens will slip off your camera. (I don't take any responsability for issues caused by this design) (sry for my bad English)