By request I give you a Hetzer walking tank.
The legs pivot at the shoulders but the rest of the leg is fixed so you can pose them a little but not much. Print two right and two left legs.
Legs are from an MWO Atlas posted by GoshaNeonRU and the body is modified from an original file that I've had for ages but have lost the original author. If you recognise it get in touch and I'll give you the credit.
Update 25/5/18. Credit to SSBN506 for the original Hetzer file. Check it out. https://www.thingiverse.com/thing:2427135