We like Barspin's Toy Dump Truck (https://cults3d.com/en/game/toy-dump-truck) and we keep it busy transporting candy around the office. Although it does have a decent job we have a trailer to get the most of it so we designed this trailer where the box is about half the size of the original truck.
Print all the parts needed.
The wheel axle itself can be mounted to the base using either 2 countersunk M3 screws or simply push two pieces of 3mm filament in their place.
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