It fit on my SeeMeCNC Orion delta printer. It works much better than the worn out hobbed gear but due to its straight design the filament sometimes comes out. I made a guide so this doesn't happen. The replacement from SeemeCNC has now been in shipping for 26 days due to the broken USPS system! Thankyou Spool3d for the quick solution.

I used this to replace the extruder gear on my monoprice maker select. Works great. It's a slightly different size than the original so remember to recalibrate your esteps after installation.