Rapid Swap Pinhole Lens for Large format

This lens allows for hot swapping of two different pinholes with a button press, for the purposes of framing on ground glass with a larger pinhole and then swapping to a smaller pinhole for taking the photo.  

Currently not film tested, I see no reason it won’t work I just haven’t taken it out to shoot and I wanted to post it before I forget to.

Sized for a copal 1 lens board, the threads themselves are M39.  The pinholes should be made on 9.5x11mm or smaller metal and glued into the carrier.  The two springs are pulled from a bic mechanical pencil and the two ball bearings are 3.5mm.  The heat sets are m2 and 3mm deep.  I printed every part solid for light reasons and because a lot of the parts are tiny.  I printed the everything with a 0.4mm nozzle, but it could probably benefit from a 0.2mm nozzle.

Initially I had a much more complex shutter design using a shutter release cable that I liked better, but I got tired of working on it and made the current shutter as a probably good enough option for the long shutter times of a pin hole.