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I purchased the servo that was linked and it can't cut through any filament I try in it. It just stalls out when the blade makes contact with the filament.
yeah that's the conclusion i came to yesterday, i got a 4.8v one coming tomorrow too. i think that will do the trick. looks like the seller he linked probably changed the item in the listing.
Check your servo and see what input voltage it uses. There was a similar conversation here. https://www.3dchameleon.com/forum/getting-started/auto3dclippy-wiring As I understand it you need the 5v 20Kg servo and many ppl are buying ones that take at least 6 to work correctly.
This is the one I bought and it also will not cut the filament. I just ordered a 5v version, I will see if it works better when it arrives tomorrow.