Bryant87's Speed Tank with alternating treads from his original design and sadkins1981's v3.1 remix.
Sides and wheels printed from PETG.
Tracks, tank hull, and center supports printed from Carbon Fiber PLA. Nice combo of flexibility and rigidity.
Driven by GoolRC S3650 4300KV Motor/60A Brushless ESC from eBay and 2 Zippy 2200 60C batteries from HK. This thing will definitely move! I had to tone it down as I broke several tracks starting to fast with the quickness/torque off the line. Also had treads stretch so much that I ended up removing a link for both sides totaling 41 per side. It was a tight fit at first, but after a slow break-in stroll around the yard several times the tracks warmed and stretched to a nice fit with much less slop.
Only printed supports on sadkins1981's v3.1 remix of the original tread