Timing belts are a fantastic way to transfer rotational motion (from a stepper motor) into linear motion (along a rail) and these GT2 belts are excellent for the task. They have a special profile with rounded teeth which reduces slippage. Often used for precision 3D printers and CNC machines.
Belting is sold in fixed lengths.
This belting is meant to be used in conjunction with a timing-belt pulley such as this parts.
Fit the following pulley:
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