Here is a (split for easy printing with no supports) fixed version of Kirby Downey's ATAT Front Left Thigh.
There was an error with the one he originally posted that made it not fit and the supports at least on my slicer messed up the detail so I split it down the middle.
Just print and CA (super) glue the 2 halves together.
you will need to print the rest of the AT-AT of course :-)
Detailed AT-AT Covers
P.S. This is a fixed version of Kirby Downey's AT-AT Front Left Thigh and all credits to him for this excellent model