Improved Folding Clamp with ruler for fabric/textiles

This is an improved version of popular Folding Clamp, easing the work with folded fabric.
Convenient set of 5 included, for easy print and storage.

This is my own model ground-up, however it was directly inspired by the listed original and thus I post it as remix.
Main differences are:
- Improved spring for printing in PLA
- Laying flat on work surface due to offset spring
- Actually clamping thin textiles due to narrower gap and better spring
- Ruler numbered in cm