no prbleme using these file for comerciale use Here's a bundle that have most items needed for book binding
disc bound notebook system 6 models.
T spacers set 18 pieces
punching template A5
Set of corner pieces 1, 1.5, 2, 3 mm
Corners jig 2 cm, 2.5 cm, 3 cm
hole punching tool 35 cm, 21 cm, 18 cm
thin spacers set from 2 mm to 12 mm (2,3,4,5, ext...)
L spacers 18 cm, 21 cm, 5 mm thickness
and more files
you can increase thickness and cut any of the models in slicer to what you need. I will add more tools and updates by time for free make sure t recheck once in a while.