Quote Originally Posted by DrUsual View Post
GAH.

I had a funny feeling that the answer would be that I'm an idiot...

You're correct, I only accounted for 3mm of wall, not 6mm.

At least I know my printer's working correctly.

Thanks!
Don't feel bad. I'm a mechanical engineer and I do stupid stuff like that from time to time. Actually, things like that are why I call my friend chris whenever I have a carpentry project to deal with because for some reason I can never keep it in my head that 2x4's are not actually 2x4" so I always end up cutting things wrong.