The passive rewinding material rack I use is based on the multi-color rewinding material rack for rabbitsFilamentalist V3I modified the bottom support legs and the width of the two sets of rollers. You can use the ones I modified, or just the rollers and support legs I modified. In the printing parameters, I calibrated the "X-Y inner contour size compensation". If you want to print it, I suggest you adjust it too, otherwise it will be a bit difficult to assemble. The buckle has a U-shaped locator. The four screws are mainly used for positioning. The main way to fix and reinforce the buckle is with strong adhesive glue.