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A cart that follows you
It began with a familiar problem: a mountain of beach gear and soft sand that swallowed every wheel thrown at it. The answer became a full engineering project — a hand-welded aluminum cart on balloon tires, sized to haul 400+ lb of gear without complaint.
Nearly every part is designed, printed, wired, or written in-house: a drivetrain tuned to ease in smoothly under load, distributed power systems that keep sensitive electronics stable beside high-current motors, and enclosures built to survive sand and sun.
Then it got ambitious. A wearable UWB tag and four corner receivers fix the operator's position so the cart drives itself — hands-free — while a spinning 360° scanner steers it around people and stops it at curbs. Prefer to drive? A switch on the remote hands over full manual control.
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Under the hood
The parts you never see — where most of the real engineering lives. Every one was designed, built, and debugged from scratch.
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Want it bolt by bolt? The complete working build manual — every step, every setting, every part — is published on this site. Read the full build guide →
Wheel hubs in carbon fiber
The stock hubs developed play under full motor torque — and when the wheels came apart, the PETG spacers had cracked clean through. The fix discards the factory hub entirely: each hub prints as two identical halves in carbon-fiber-reinforced nylon that lock into one solid body — mounting bell, tire barrel, and bearing boss in a single piece.
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The KMJ Dynamics way
An independent shop with no blueprint handed down. Welded frames, custom power electronics, and autonomy code all come off the same bench — driven by one habit: keep building until the idea works in the real world.
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