I'm ordering a new belt as I cut mine a little short.. but are there any GT3 14 tooth pullys or is 14 tooth only GT2? Thinking that might help if its skipping.. What do you think? I've tighten the belt more now and think that might have helped to, but since I'm waiting for a new encoding strip I'm not able to test it yet..
I haven't seen any but also didn't look extremely hard.
Mark your existing belt and pulley with a Sharpie so you can see if the belt is actually skipping. It's a good idea to mark the pulley and motor shaft as well to see if it slips there.