John,
Guarantee that this your set screws on the pulleys. I documented the issue here that is the exact same as yours:
This is the full solve with parts you need to purchase (it’s only a few $).
This is a frustratingly simple fix. It’s a bad experience for a new user trying to learn a machine and track an issue like this. You get all this advice on how troubleshoot it and misdirection about material forces, speeds and feeds, and slotting. The short story: it’s a design flaw that Carbide3D could resolve.
I’m at a loss on how to get the Carbide3D team to implement straight out of the factory. It’s a near zero cost solution for them, switch out current inadequate grub screws with better cap screws and removable thread lock. I’ve tried escalating here and emailed support. I’ll try again emailing support.