Mamiya RB67 Pinhole camera for 6x7, 6x8 film back

21 May 2026 Update

1. Fixed the clearances in the back mount — Pro SD backs now attach without any issues
2. Removed the protruding “tooth” at the bottom of the mount that prevented early RB67 Pro backs from fitting properly
3. Added a body version with embedded 1/4 nuts for tripod mounting. To insert the nuts, you need to add a pause in the slicer, place the nuts into the print, and then continue printing
4. Added a body version with a tripod mount using a heat-set brass 1/4 threaded insert

5. Added a front shutter cover version with an f/167 marking

    

Camera Features

• Compatible with all common RB67 film backs: 120/220, 6x4.5, 6x7, 6x8, Pro, Pro S, SD, Motorized
  Tested with: 120 Pro S, 120 Pro SD, Motorized 6x8
   
• There is a button that simulates the camera shutter release and signals the film back that the frame has been taken, allowing the advance lever to be unlocked for the next frame
• Two tripod mounting points

• Cold shoe for accessories such as a viewfinder, light meter, level, and others

   

Camera Parameters

• Pinhole diameter — 0.3mm
• F-stop — f/168
• Angle of view — 62 degrees (35mm equivalent on 135 film)

Required parts

• х5 М3 bolts 20mm lenght
• x6 М3 nuts
• x2 1/4" nuts or heat-set brass inserts for tripod mounting
• x1 small spring, 4mm diameter
• x1 Pinhole — 0.3mm

Print Recommendation

I used PLA filament and a 0.4 mm nozzle for most parts. Only minimal supports are required, and most supported areas will not be visible after printing.

To print the wheel with better detail and a cleaner look, I used a 0.2 mm nozzle.

The “Mamiya” logo was printed using a pause in the slicer: first, I printed the lower black base, then paused the printer, changed the filament to white, and continued printing. This resulted in a single part with a black base and white letters.