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It’s why desktop 3D printers are such a powerful tool ... and the other connected to a standard GT2 belt and pulley to move the pen back and forth. We particularly like the way [Lost Projects ...

However, [BManx2000] found that the way the filament simply sticks out of the back of a 3D printing pen like a bizarre tailfeather was troublesome. The solution? A Mini Spool System for 3D ...