I am in the process of building an i3 MK2 clone from the budget build article. There are many sizes of M3 cap head bolts. Buying these individually is somewhat costly as you either end up buying small quantities, or spending less per unit on large quantities - but have lots left over. I see a few kits that have various sizes - but not all are a 100% match.
My question is: How substitutable are these fasteners with each other? Will an M12 work in place of an M10? Thanks for your help!