A bolt together modular tank style robotics platform! I use this with my students. They get the base kit, then they customise. I have run these with Arduino, Raspberry Pi and Intel Galileo, both in autonomous and controlled drone mode. These tanks are very versatile and it is easy to create bolt on accessory holders as you need. I will post the accessories I have created here from time to time. https://youtu.be/RU1G50hiegI THERE ARE SOME BASIC ASSEMBLY INSTRUCTIONS IN THE IMAGE GALLERY. YOU NEED TO VEIW THEM IN FULL SCREEN. BASE TANK PRINT: 2 x Track Inner Frames 2 x Track Outer Frames 1 x Base Fram 1 x Upper Frame (You can do more of these) 2 x Cog PRINTING TRACKS: Different printers and different filaments produce different results, so I have uploaded a range of tracks with different pin holes. Essentially I print the at 50% infill and print the smallest hole diameter I can. If I need to loosen the tracks, I then print a few larger diameter holed tracks. MOTORS: I use the generic motors linked below and install 4 of them: http://www.ebay.com.au/itm/1X-for-Arduino-Smart-Car-Robot-Plastic-Tire-Wheel-with-DC-3-6V-Gear-Motor-New-/131459704359?hash=item1e9b9be627 I use this motor shield to drive them: http://www.ebay.com.au/itm/Dual-H-Bridge-Stepper-Motor-Drive-Controller-Board-Module-For-Arduino-L298N-TG-/181687932010?hash=item2a4d71d46a PUTTING IT TOGETHER: I used M3 bolts to put it all together. The motors need to go in before you bolt the track frames onto the base frame. I use 30mm brass standoffs to put the top frame (and any other stuff that I want) on The tracks need 2mm dimeter wire (or bamboo skewers). They need to be loose enough to spin freely without being too loose. Aim for the tracks to sag about 10mm when suspended in mid air. ACCESSORIES: