Zen Toolworks CNC Carving Machine DIY Kit 7x7 F8 Low Gantry Free Upgrade to 7x12 F8 Low Gantry FREE UPGRADE to 7x12 LOW GANTRY (travel distance grows from 7"x7" to 7"x12") PVC Frame, Steel guide rods and precision linear bearings provide maxium accuracy and rigidity F8 Leadscrew with ball bearing end support All replacement parts are still available for models back to 2009 7 x 7 x 2 inches travel capacity