Ultra Compact Spool Roller for 4L Drying Boxes

This ultra‑compact roller assembly is designed specifically for narrow 4L filament drying boxes—such as cereal containers with an internal base size of 68 × 210 mm. Standard spool holders won’t fit inside, but this model allows smooth rotation of spools up to 65 mm wide, thanks to four 608ZZ bearings mounted on a central axle with printable locking rings (included in the design).The overall shape resembles a mini skateboard, and the construction follows the same idea: a long, narrow base with four rollers acting like wheels. You don’t need to print the entire model to check if it fits your container — one of the included plates contains a Test_size_68x210 piece. If your box has tight tolerances, printing this test plate first is highly recommended.The roller can also be used without any box, as a standalone compact spool holder.Perfect for makers who want to turn small household containers into fully functional filament dryers without external stands or modifications.Boost MeThank you