Robots for 28mm (1/56) sci-fi wargaming

A set of slightly whimsical robots for 28mm (1/56) sci-fi skirmish wargaming.
They probably won't scale down well with an FDM printer; I've not tried.
The torsos and legs/tracks should be interchangeable between most robots.
The arms for robot1 currently don't have grippers attached, but these are easily fabricated from plastic scraps or epoxy putty (or spare weapon-holding hands from plastic figures).