Quote Originally Posted by lucan07 View Post
UPN or IPN and angles are not recomended from what I gather because while they have good strength they have a tendancy to twist or deform more than closed box section. As in your video of the fixed gantry machine www.youtube.com/watch?v=K9UA9ZRFwWU UPN when used tends to be closed forming box section for strength.
One (Maybe stupid) question, when the guy on the video add a plate to the UPN to get more strength gantry, they get a lot of deformations, so they mill the piece for a flat surface right? Epoxy will be useful too for flat surface too?