This is a holder for 110 sized film negatives. The holder exactly fits the standard 35mm template that comes with the Epson V600 film (and negative) scanner. The holder has bands to block out the area between pictures and a small peg to align the negative strip.
I designed this to solve a one-time problem, of scanning my (very) old negatives where the printer scanner tray didn't directly support that format.
I can provide the .SCAD, but it's currently using other libraries and is a bit messy to extract a single file for upload here.
Designed to not need any supports. You may need to polish or sand the print to remove even tiny threads and burrs since this will get scanned at high resolution.