1.
If the paper curls up at the edges and it bumps to the knife it can cause paper jam and stop the machine. With a peace of plastic plate or a peace of wire as in the pictures you can avoid this problem.
2.
If the adhesive band sticks on the guiding screws it can also cause jam. Put a small (1/4") drum sanding cylinder on the guiding screws so that it can turn around and the problem is solved.
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