This adapter will let you use Canon FL lenses on a Canon EOS camera. I couldn't find an adapter like this that could be 3d printed anywhere, so I made one myself. I tested this mount on multiple cameras with a 35mm macro lens and it worked great. TO PRINT: turn on supports and use your slicer to make the model as strong as possible. AFTER PRINTING: The FL side of the mount may break off when you try to mount a lens for the first time. Re-attach it with superglue and you should be good to go. NOTE: This model should not be used as a replacement for a commercially made lens adapter. It is not as durable as a commercially made adapter, and may jam or break inside of your camera, especially if using a weaker filament like PLA. Always test any accessories thoroughly in a camera you care less about before putting them in a camera you actually use. DO NOT use this adapter with lenses longer than about 6 inches, or with lenses that require you to push or pull on the lens to focus or zoom. Designs I used to help me make this are listed here: https://www.printables.com/model/143756 https://www.printables.com/en/model/282610-canon-flfdfdn-lens-to-leica-m-body-techart-pro-lm-/files