Polaroid custom 4x5 film holder for pack film back

thingiverse

This is both the framework and a full model to make a custom 4x5 film holder that fits into the 4x5 back for Polaroid pack film cameras made from https://www.thingiverse.com/thing:5254390. This film holder is smaller than a standard 4x5 film holder, and is designed specifically for the Polaroid 4x5 back. Tested for light tightness with ISO 6 litho and paper negatives. Print 2 side rails, 2 pressure plates, 2 hooks, and 1 of everything else, or, print the full film holder and 2 pressure plates. You'll need black mat board cut into 163mm X 105mm, then glued to the rails in the middle and the ledges above the middle. Mat board is used to shim the opening by cutting a 40mm wide piece and gluing it between the pieces of mat board. The top piece is glued to the end. For this and the full model, a piece of black felt is glued to the opening. You may need a piece of bristle board under the felt to shim it enough to provide the light seal. The pressure plate is taped or glued onto the top of the felt. A piece of black bristle board (thick poster board) is cut 105mm X 210mm for the dark slide. The hooks (print 2) are used to hook around the front of the camera on the right side to keep the film holder pressed against the film plane. String some rubber bands through the slots and secure them with a clamp or tape.