Open source with STEP files
Uses M4 and M3 hardware, but you can edit this yourself.
Print 2x of the top knobs, except the middle one.
I recommend putting in the heated inserts first, then attach the two RED parts of the body together with glue or acetone if your are using ABS or ASA.
Insert the front dark slide/shutter before putting on the lid.
The body parts should be printed in black plastic.
Recommend using a tiny pinhole for this, smaller than 0.2. The test shot I've provided is a 0.2 (I think), and gave the best result at ~1 second exposure with Adox CMS 20 @ ISO 20.
The author marked this model as their own original creation.