M12 Lens Extension

Had a problem mounting some lenses on Raspberry Pi derivative cameras, especially the shorter M12 mounts so remixed this as a short extension.

Printed using a 0.6 nozzle which worked well with V1.6 but might be better with a 0.4 nozzle or smaller.

0.06 layers, but it might be OK at 0.10 layers.

Print 2 or one other item at the same time to help cooling is it prints

Clean up bed edge to ensure thread has clear start. Make sure any cleaning up is fully cleared away before inserting onto camera body, probably a good idea to try fitting a lens and check the thread thoroughly before fitting to the camera body too!!