Warping with raft

[rforeman]

How often are you guys finding you need to re level the bed?

I will check mine every 5 or 6 prints. it just so happens that I had cleaned the bottom of my machine and had bumped one of the wing nuts and knocked it out. Does not take much. I did not check the bed after I bumped it and it had knocked it out by about .3 mm. I say check it often.