Grooved Bushing

I didn't like the spool holders that came with my new, dual head Lotmaxx Shark V3 printer. The angled metal brackets are fine but I wanted the spools to reside closer to the gantry and I wanted that distance to be adjustable.. See my 25mm x 100 mm bolt project published here on ‘printables’ for the other parts - bolt, giant backing washer and nuts (two required). I really like this machine so far and I recently learned in printing cylindrical bushings that by adding the series of rather small grooves to both the ID and the OD of the bushing the surface finish of the ID and OD are vastly improved in PLA - especially no stringing within the hole. This tip can of course be applied to any bushing.