I’ll presume that you’ve already oiled the rods going to the print head with sewing machine oil, and that things appear to move around pretty smoothly for the hot end.
If you’re able to get it to print, I’d recommend checking your rail alignment with the tool from thingiverse…
Slacken off the grub screws that hold the belt gears against the shafts, and then with an alignment tools clipped at each end, tighten them again. This will ensure that everything is parallel and should help keep the travel smooth.
If you’re still having problems, then measuring the stepper driver current settings is a good idea too. IIRC, they were set to around ~1.6V on my machine by default.
Hope that helps.