Summary I designed this excavator for the mini digger from TC_FEA ( http://www.thingiverse.com/thi... ). The only thing i changed on his design was the baseplate. With the new plate it is much more stable and a lot stronger. For the track i used the track design of KRUX( http://www.thingiverse.com/thi... ) but i designs a new wheel base to fit under the excavator frame. Hardware needed: 40x M2 nuts and bolts for the tank tracks 44x M3 max 30mm (you will need different lengths but i just bought 30mm and cut them to the lengths i needed) 2x M8 bolt 6x M8 nuts 4x M8 spacers Print Settings Printer Brand: Leapfrog Printer: Creatr Rafts: No Supports: No Resolution: .20 micron Infill: 20%