MP Select Mini revised spool holder for small spools

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I recently purchased some AMZ3D filament and discovered that the spool wouldn't fit into the spool holder. The center diameter of the spool was too small, making it impossible to insert. To resolve this issue, I redesigned the holder to accommodate various sizes. I incorporated three bearing spaces to ensure versatility with different-sized filaments. This new design will securely hold standard-size filaments and smaller AMZ3D filaments without any issues. However, I haven't tested larger spools with a 1/2kg capacity, but anything with a center diameter of 30mm or more should fit perfectly. The holder slides onto the side, just like the original one does, but it's designed to be snug, so you might need to sand the back slightly if it's difficult to attach. I experimented with a looser design initially, but it caused the holder to sag. This revised version is tightly fitted and remains straight. The black bearings used in this design were salvaged from an old Batman spinner.