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 sold as supposed 100mm ones, but that's not the same size. Measure the rods you buy, and pick the appropriate fixed bracket.

# Parts Required

* 4x 688 bearing
* 2x 8x100mm smooth rod _or_ 2x 5/16x4" smooth rod
* 4x sticky feet (3M or similar)

# Assembly

* Insert the bearings into the pulley
* Insert rods through the sliding carriage and bearings which will hold the pulley in place on each side
* Insert pulley into the fixed carriage
* Fit one rod through the fixed carriage and be