Threaded Pulley

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A threaded pulley is probably the best gear to use on extruder - see Geared Nema17 Extruder and NopHead test results. Example usage on Geared Nema17 Extruder:

M8 2inside.jpg

There are a few ways to make a threaded pulley, using a lathe or witout a lathe.

Making a threaded pulley without using a lathe

Use a hand drill and a file to cut the slot, then hobbed it with an M3 tap mounted in the drill, using bearings mounted in a vise to let the bolt spin - see this videos:

Video using

M8 2.jpg

M8 2inside.jpg

Making a threaded pulley using a lathe