Printrbot X-axis sag compensation

** update Dec 30, 2015 - Made them a bit wider so that they would be able to take a bit more abuse and keep bed in place longer.

Print 4 of these with a flexible filament (I've used ninjaflex) and put them in between the print bed and the printers frame.

I based this off of a forum post where someone used spring/locking washers to do the same thing. I'll link to it here if I can find it again.

I'm not sure how long it'll keep the bed level (before the ninjaflex breaks down), but so far