In my opinion, this is the easiest and most complete tutorial to walk you through building a large platform 3D printer and the Sketchup File is included for you to make any changes needed.. The Plastic Beast is a CoreXY Printer with a build platform of 440mm square. You can print 600mm or about 23 inches diagonal. Any level of user from novice to expert should gain something from my tutorial.

Started with a Rigidbot Big Added a single flat glass bed Used a Smoothieboard clone driving DRV8825

Over 840 parts. Of whom around 450 are screws and nuts, more than 100 parts are printed on a 3D printer, the frame consists of about 60 components. There is nearly 40 electrical components connected with tens of meters of wires, most of them sleeved.