Spool holder for large filament spools

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This is a straightforward spool holder designed for large 300m spools with 3mm filament. The design closely resembles many other holders, but this one utilizes a precision-cut sandwich plate milled by a CNC machine for its sides and sturdy M8 threaded rods to keep the entire structure intact. If you lack access to a CNC machine, the sides can also be printed in plastic or even lasercut in plywood or acrylic.