Remix (from scratch using Fusion 360) of thing:
This has an enlarged inner diameter (70 mm) to fit larger rolls of wrapping paper. This was sized to fit the rolls from 'BJ's' No idea if this would fit the costco rolls which are also large.
The blade slot is designed for a #11 razor blade. I found that if you hold the blade w/ pliers so that the back edge rides 'square' against the rear slot, it slides in real nice on my prints. If the blade gets 'crooked' it doesn't slide in as well.
Filament was 3dxtech Max-G Transparent Xenomorph w/ Gyroid infill at 20% and 2 perimeters. This can also be printed in PLA (and other materials of choice)