This is a 3D printed base Vehicle, I was disappointed with what was available/quality of other projects so I created this with the goal that’s it’s easy for anyone to modify or add on to. Using duel stepper motors this tank is fully controllable and turns on a dime. Youtube Video of it in actionhttp://youtu.be/C18eJW3MO5cThings required 1 Arduino of choice 2 Stepper Motor Drivers (I used Adafruit Motor Shield with two drivers built in) 2 Stepper Motors 4 Stepper motor Screws 5-8 mm in Length Optional Items Adafruit Bluefruit shield (wireless control) Lipo 3s 11.1 V battery Only 4 screws are required for the tank 2 Screws for each Stepper Motor Use 1.75 mm filament for assemble of the tracks they should require being gently tapped in as the outer holes are smaller than the inner. What you need to print I Printed these items at 15% fill .25 height Time # Item 1h 2 12spoke Gears 1h 2 8spoke gears 2.5h 1 mainbodytank 5h 54 TankTreads 0h 54 20mm x 1.75 mm filament rivets I have supplied all original FreeCad Drawings The default wheel spacing is 140mm if you make your own body To make Additional Gears/Change the sizes in FreeCad goto Macro and then C:/Program Files (x86)/FreeCAD0.13/Mod/PartDesign/Scripts Here you will a script named Gear.py the parameters you will need are EXAMPLE: Number of Teeth 12 (This is the value you change) Circular Pitch 16 Pressure Angle 4 Tooth Height Factor .5 Tooth Clearance .01 Tooth Lateral Clearance 1 Gear Width 6.0 This is the part that sucks the gear it created cannot be cut/Boolean so then you need to create circles and rectangles with chamfered ends (I used even numbers so I could just make one long rectangle then chamfer the ends then you can copy paste and just rotate them into order (warning large numbers of teeth take a long time to combine these do one at a time) For the Arduino Code Check the zip file and readme The Arduino code uses Serial inputs to control the tank and controls both the tracks separately.