This is a lens board to fit my MPP large format camera, and a Copal No.1 shutter (hole is 39mm in this case).

It can easily be edited to fit other cameras or other shutter sizes. The notch to keep the shutter oriented can also be relocated if you prefer your shutter release at a different angle.

It fits perfectly, a bit of filing on the inner circle as expected by that's all. I'm happy for people to use this to print their own. If you are printing for others, only do so my attributing me as maker, please.