2GT GT2 40 teeth BF belt pulley hole 5/6/6.35/8/10/12/12.7/14/15mm tooth width 6/9/10/15mm for 3D printer parts

2GT GT2 40 teeth BF belt pulley hole 5/6/6.35/8/10/12/12.7/14/15mm tooth width 6/9/10/15mm for 3D printer parts

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