It’s all about the loading – Firstly make sure the roll is nice & tight and even on its cardboard tube. Bring (as said before) a meter’s worth of material through then align using the marks on the front of the machine to help. Engage pinch rollers, hit enter and watch how the material tracks back – good indication how straight its going to run.
For really long runs I have even manually advanced the material to check tracking – Time consuming – yes, worth it when the job tracks correctly – yes.
Check You-Tube too theres a few video’s my assistant found & watched (while he should have been working!)