Inspired by Martin’s Mini Digger I made a dump truck for my son. Taking a different approach to normal it is made from glued slices of 4mm Ply with 3mm steel axles. The wheels press fit on to the axles and the bucket is hinged on the rear axle. My son has now decided I have to make more construction vehicles, the first one being a tractor (more farm yard but never mind!). Will upload the files when I get a chance to thiniverse
UPDATE:
Here is the tractor – I will get these up on thingiverse soon.