no prbleme using these file for comerciale useHere'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.