Sliding Adjustable Spool Holder v2

A spool holder, sufficient for placing on a shelf. Many of these have been made before, but this one is mine. This is a new version of [this spool holder](https://www.thingiverse.com/thing:3122540) which corrects some issues in the original design: for very full spools, the original could catch on the filament; the new version no longer has this issue.

The Fusion 360 archive `.f3d` is included, if you need to make any changes. **Two sizes are included** because it's common for 4" rods to be s