The idlers in my Anycubic kobra 2 neo printer were factory crooked, which caused the toothed belt to move sideways and its tension changed with the movement. So I printed my own rollers, which are already straight. If you use a printer in a closed chamber, use ABS or another temperature-resistant material, for a printer without a chamber, PLA is enough.
Note: to get a good printing result, use a low layer, for example 0.08 mm, you must also have a well-calibrated flow so that there are no defects and that the bearings do not fit too tightly.