IKEA Kallax Filament Storage Rack Slideout

This is a remix of @Celta's amazing Kallax hack.  I had issue reaching the back rolls of filament without emptying the front, so I cough cough used TinkerCad to add a rail to the front mounts.  It also makes the distance between them more narrow which helped with my 1m-cut-in-3 steel rods.  Definitely pull and push from the middle of the rods.

Rails were added to the front rod mounts allowing them to slide out.