Fixing a Warped 3D Printer Bed

The bed of my Printrbot Simple Metal (model 1403) was pretty seriously warped. By "scraping" it with a power sander, I was able to make it flat! Desi Quintans' article on bed leveling: http://www.desiquintans.com/bedlevel Bed inspection utility: https://github.com/npiegdon/bed-inspe... Surface plate: https://www.amazon.com/dp/B0000DD0KC Roller: https://www.amazon.com/dp/B000BYVMFC Canode spotting ink: http://www.artcotools.com/