I love the idea of putting a spool in the chamber.  Preheats it, dry's it (some) and seems like a good thing.  But only if you can swap new spools out fast/easy.  I really didn't like the idea of having to loosen a screw to remove a spool.  So, I made one that is spring loaded.  This also allows the parts to be printed on a 200x200 bed (unlike the original file).  You can easily just bolt the parts together tight if you don't want it spring loaded/movable.  I've also revised this to have additional M3 bolt hole and heatset to make it “rigid” and non-pivoting too, if you like.

Only the one center frame part needs supports on the two arm over hangs (just paint the bottoms of the two ends and use manual supports).  I would STRONGLY urge you to follow standard voron PIF print settings and use ASA or ABS (40% gyroid, 4-5 walls/bottom/top, 0.20mm layer).  I actually upped the infill and walls on the wheels to make them less prone to snapping at the holes.  I also would use gyroid fill and use montonic on top/bottoms which will help prevent splits along layer lines in the wheels.

Assembly involves 4x M3 heatsets, 4x M3x10 SHCS bolt, 4x M3 washer per arm you want to spring load.  2x M5 heatsets, 2x M5x12mm the arm pivots, and optional 1x M3 heatset, 1x M3x12 if you want to “fix" each arm rigid.  Spring rod is 3mm diameter in 90mm lengths for each arm.  Plus the original hardware for rollers, bearings and mounting to frame (see original authors page).  I've included his latest update to the bearing caps that print horizontally and do not use any M3 inserts for strength (as well as the original ones).