Customizable sanding stick Remix

I found the original code for these sanding sticks on Thingiverse https://www.thingiverse.com/thing:2404850. But I didn't like the printed screws, so I added an hexagon to the bottom where I glued in the nut. This increases the strength en usability.

I used 3D tool to check every important parameter of the compete box.
https://www.3d-tool.com/en_free-viewer-download.htm