sanding paper holder

I create this sanding paper holder for modelling.
It is create to use strip cut from sanding paper (280x230mm) or from drywall sander grid (280x93mm).
Holder use strip 280x30mm.
How to assemble strip see in video. Design itself is very very simple. https://youtu.be/_yio6fO_hgA
This is completely mine own design.

Needed non printed parts:
1x hot melt M4 nut, length 6mm, outer diameter 6mm
EDIT OR
1x M4 hex nut when use classical nut
1x M4 hex head bolt, length 20mm