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15 tooth/groove type L timing belt pulley
This is a companion to the 60 tooth pulley. It fits 3/8" pitch x 1/2" wide type L timing belt and has a 1/4" bore to fit on a NEMA-23 stepper motor.
I printed at 20% infill, 0.25mm layers, 3 perimeters and 3 top/bottom layers. I used the same XY scaling in slic3r as I used for the 60 tooth pulley to print this (-0.2mm).
Original file is shared at OnShape: