Designed a 3D printable DSLR scanning holder for 35mm/120 you can download and print for free

https://www.thingiverse.com/thing:4686924

35mm versions: standard 24x36, pano 65mm, and standard w/ exposed sprockets.
120 versions: up to 6x7, or 6x9. The 6x7 version will be flatter overall.

Unsure where else to post this, but wanted to share!