M42 adapter for GuerillaBeam

3d printable adapter for SLR lenses with M42 or T2 mount.

**Retired in favour of [GuerillaBeam SLR lens adapters](https://www.thingiverse.com/thing:1062085)**

Prints available at the [GuerillaBeam website](https://gbeam.de/products/lens-adapter-for-pentax-pk/) (worldwide shipping).