adjustment-free spool roller

Design Goals
==========

* Compatible with a range of spools without adjustment
For easier spool swaps. The design was inspired by my frustration with fiddling with https://www.thingiverse.com/thing:1332650 every time I swapped spool brands. I have specifically tested Esun, Paramount3d, TronXY, Ninjaflex, HobbyKing, but it should work with just about anything that fits in the dry box.

* Fits in a rubbermaid 21c container
used as a dry box (1776473).

* Prints quickly using a 0.6 nozzle
23g of filament, under an hour

* Minimal part count
* * 4x 608 type skate bearings
* * 2x: roller_608x85mm_VASE_X2.stl (printed)
* * 2x: side_support_100mm_21c_x2.stl (printed)

(the rubbermaid box is too narrow to use 100mm rods and trimming rods is a pain).

There are lots of very nice designs that use far more filament and take 8-36 hours to print. They are great if you want to leave it permanently attached to your printer and nothing I felt like printing a dozen of.

The flare