GT2 Timing Pulley 20 Teeth 5mm Bore for 6 mm Belt comes with 20 teeth or grooves is one of the best choices for 3D printer construction. Compared with the T2.5 or MXL timing pulley, the GT2 pulley tooth profile is anti-backlash.
 

The rounded teeth of this tooth and belt are engaged together longer providing a smoother transition between teeth. This is what you need for your 3D printer. A smaller pulley with less teeth moves less belt per revolution.Not great for printing speed but with a 160 step motor and a 20 tooth pulley that means every single tooth on your belt can move in discrete steps! That's going to make for some really nice prints!

This pulley has 20 teeth and a 6.35mm inner bore. Two set screws can be used to attach it firmly to any 6.35mm diameter shaft. Full aluminum construction means these are very light and very durable.

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