I already asked this on stack.exchange, but it seems like there few people, so I decided just copy my question here, if it dont break rules. So,
I did stand for my model, and I want to do support edges on 3mm at all faces. I did this everywhere by this method: I press ctrl + R, created loop cut, bring it to the end of the face and then move it, like G + X + 3mm.
When I got the last loop cut, I faced a problem: I cant move loop cut on Z axis, because face is oblique. I looked for how I can solve this, maybe move loop cut not on the Z axis, but move on normal axis.
You cant split one edge, then with mesh tools addon set the length for the upper edge part to .03 (change behavior to clockwise), then loopcut and move it to the split, the cut will stop, merge the helper vertex.
Okay, when I apply scale (ctrl + A > Apply all transforms) and did this again, it works. But how can I did this without applying scale? If I change units to millimeters, it is just change their displaying, but 3mm edge is still not 3mm.