About this 3D model

There might be some error with the box, some people said the last axis will block the hole position and it can't be punched. It's suggested to mirror the fourth one from the left, which is also the last one, before printing or buy a same-size box but with a flat front side. 喵武士 , the rest is the same as the original version, each needs 4 686 bearings and 3 106 bearings. Wrap some anti-slip stuff on the roller, like badminton racket grip. After shortening, it can just fit into the Bing's spool (please test other spools by yourself), but there will be a concave place in the middle of the lid, which may grind against the spool. It's suggested to buy a flat-top one, or like me, heat it up and press it flat haha.