This is an evolution of the open612 specifically. I added camera strap lugs, corrected the window hole location and modified the top and darkslide to allow the use of hair tie as a light seal. the darkslide includes a v notch to keep it from sliding down when in use, and indicates when it reached the top of it's travel. The original had incorrect numbers and the hole was in the 645 position which led to overlapping images when using the printed numbers.

use a piece of red plastic over the hole, or use a piece of c41 film leader.

the lens cone was redesigned to use the Nikkor-W 135mm f5.6 4x5 lens but may work with other 135mm lenses.

Use a matte black paint on the inside to minimize internal reflections - black 4.0 recommended. 

You can print in regular PLA, but do not leave it in a hot car. it will warp.

Printing in PLA Tough+ or PETG recommended. 

Black material recommended, light colors may introduce light leaks.