Assembling Rollers. For “Legs” use 1 inch 5/16 bolt, 5/16 nut and 608Z ball bearing. Insert bolt into ball bearing and into the rollers hole. Depending on quality of your print you may need to screw bolt into the hole. and fix it with nut For middle part you need 1 1/2 inch 5/16 bolt, … Continue reading Rollers