The starting point here is a big one: Kacper set out to build a drivable, camera-equipped tracked vehicle inspired by the Leopard 2, and to do it almost entirely from printed parts. What began as a hobby idea has grown into a heavy radio-controlled FPV platform after what sounds like a long stretch of designing, testing and rebuilding.
The mechanical layout is a proper tracked drivetrain. The hull is assembled from panel segments joined with socket head screws and locknuts, and the running gear follows a Christie-type design: five suspension stations per side, each with vertical coil-over shocks and a dual road wheel set, a toothed drive sprocket at the rear, a front idler with an adjustable spring tensioner, and three return rollers. The 70 mm double-pin tracks use interlocking links with metal pins, and drive passes through 15.5:1 gear reductions. The brushless motors and ESCs are plumbed into a liquid cooling loop with two rear radiators, fans and a pump.
The electronics side is where this build really stands out to me. A custom carrier PCB carries the power connectors, auxiliary ports and an ESP-based controller, and a smartphone dashboard over Wi-Fi shows temperatures and toggles the lights and cooling pumps. Dual FPV cameras give front and rear feeds with battery and current telemetry, and the rear lighting reacts to throttle. At 66 x 39 x 25 cm and 12 to 14 kg, with 30 mm of suspension travel and 70 mm of clearance, it hits roughly 21 km/h and handles curbs, grass, dirt and pavement.
One trade-off worth noting: mounting the radiators at the rear pushed the hull a few centimeters taller than planned. Payload capacity is still unknown, with a 10 kg dumbbell test planned, and a rotating turret with an FPV camera and gel ball blaster is next. STL, STEP and PCB files plus a Gitbook build guide are all shared for anyone who wants to build or modify it.
Project by Kacper. Watch it on their YouTube channel: