I have an assembly where this blue brown slab protrudes into the purple body. It insists I have a clearance when I cut it out and I actually need some sort of clearance when the parts are injection moulded in plastic. So I have mated the parts, indented them with a little clearance, and then mated them again. I am a bit worried that moving them for the second mate will cause a 'second cut'. I have also got the clearance wrong and would like to expand it which will break a hundred mates all over again. I don't know what the correct procedure is for that. Any help welcome!

Also how would you line that brown face up with bright purple face in an assembly?

Huge thanks.