This adapter attaches to the camera's tripod socket and does not mechanically load the camera's lens. It also grabs the eyepiece tube on the microscope and does not grab the eyepiece itself. This puts all the load on the eyepiece tube, but it seems to be OK. You have to zoom to 50mm or else you'll get vignetting. There are 3 parts to print- the base, the camera lens coupler, and the eyepiece coupler. Once you're sure it all fits properly, screw the base to the camera lens coupler and glue the eyepiece coupler to the camera lens coupler. The whole thing fits tightly on the eyepiece tube which you can easily resize to match your own microscope. I printed with Coex3D ABS, 0.25mm layers, 30% infill, 3 top and bottom layers and 3 perimeters.