Graflok 4x5 Enlarging Back

Designed for my graflex crown graphic, should fit all graflok back cameras, other 4x5 cameras may also be compatible if you can remove your ground glass, but without an easy way to secure the base.

I split the three main components for design flexibility.  The base is what sits on the camera, a defuser rests inside.  Then the tube is placed on top of the base with the bulb holder on top of that.  The whole assembly can be taped together to limit light leaks.

I printed everything in PETG at 100% infill, be warned if the light is left on for long periods it can get quite hot.

Optionally I covered the inside of the tube with aluminum tape to attempt to bounce light, this is mostly coping enlargers I've seen, not sure how necessary it is.  I have been testing with the 60mm tube, but I have also included a 100mm tube that should decrease vignetting farther, but I found it unnecessary.

The defuser I have been using is a sheet of acrylic cut to roughly 147x113mm to fit inside the base.  I have also included some defusers that could be printed out in white, however I tested the 2mm one and it did result in projecting some imperfections in the print, a better print would probably be usable though.

The light source I have been using is a thirdreality smart bulb at 100%.  There are likely much better light source options.  Be careful with how much heat your light source generates, leaving the light source on for long periods results in a build up of heat.

That should be everything you need to know to successfully use my enlarger back design, let me know if you need any help or have suggestions.  Also please share if you successfully make any prints with it.

Supplies (affiliate links)

Light bulb socket - https://amzn.to/4vXEWxt

Acrylic Sheet White 32% Translucent Cast Plexiglass 12” x 12” Square Panel 1/8” Thick (3mm) - https://amzn.to/4eNVgue

Thirdreality Smart Bulb - https://amzn.to/48CEN8C