I looked at all the available options (free and expensive) and tried to implement things that I thought were missing in this design.

I wanna be able to print faster than some available options and also more modular
So the main part would take about 5hrs to print and for 120 you would need just extensions.

Some features:

• Universal and modular design, you print what you use.
• Suitable for half-frame up to 6x9 120 film
• S Curve for help with film flatness.
• Masks for all popular formats.
• An extra slot for a diffuser layer in case you have issues with texture from your light source.
• Optional advance module (135 only)
• Optional Motor advance module (135 only)
• Easy to change configurations with magnets

Important! This tool was designed and optimised with scanning full rolls in mind, you can also use for strips (recommend to check the "Mini") but this kind of holder will never be ideal and you may have issues with the first and last frames since they will not be able to reach both ends.

You will need:

• 6x1.5mm magnets
• Skateboard bearings
• M3x10mm Screw
• Superglue
• Flex filament or just buy some small rubber feet (5mm)
  (For the motor module check part list on the link)

Watch this video to see how it works:
https://youtu.be/FfapKIvoG48

*Updated Nov/01/2020
Addressing the feedback from some early adopters saying that there was too little or no clearance in some parts resulting in not being able to assemble, I went back on the the files and review all. The overall tolerance is 0.2mm and with a fairly well calibrated machine this should be not a issue now.
If you still having problems even after some light scraping on the joints I would recommend you experiment with "Horizontal Expansion" setting on Cura. I'm sure there is a similar feature for other slicers, something about -0.1 (negative number) should fix.
I cannot add anymore to those numbers since the parts are already too loose on my printer and this supposed to be a precise tool.

*Updated Nov/07/2020
Added a shorter version of the main pieces for people interested in 35mm only.
You can still do half frame
The files are the ones named "Mini"
This version can be printed in 4hrs and will still work with the advance knob module.

*Updated Nov/18/2020
Motor module released
I don't have much knowledge on electronics and Arduino so I will not be able to provide any support.

Just look at the post from Seckin (the original creator of the motor), the information is all there.

• https://www.duckafterduck.com/blog/make-yourself-an-automatic-35mm-scanner
  For the Arduino Sketch parts list and some photos of the circuit wiring check the link bellow.
• https://drive.google.com/drive/folders/1nMrXm9nCD6jsxX4C_oQ4nAMLyARmD3Yk?usp=sharing
  If you wanna see in action there is a quick video.
• https://youtu.be/KpETHROQWGk

*Updated 24/12/2020
After a lot of fine tuning, small changes and also many actual working prints done I consider this now finished and for this reason I also making the STEP files available so feel free to mode as you like.

If you find this tool useful consider a donation, any amount wound be appreciated, and will be spend on film and other stuff related to analog photography.
Paypal [email protected]
https://www.paypal.com/donate/?cmd=_donations&business=BP8YS4BFBT8F6