MechWarrior Online Huntsman, roughly 125mm tall.
Fully articulated, and tested, all parts should be error free and printer friendly. Multiple Torso and weapon options, and like the Atlas, does not require any glue for assembly. The scale might not be quite rite though, as I scaled it so that the medium lasers were roughly the same size as the ones on the Atlas. And I also used a scale table from Mech Warrior Online, but, as the Huntsman was not on the table I had to guess a little useing other 'Mechs in the same weight class. I have printed it at 75% scale and most of the detail, and all the joints still print/work, so if you would like it slightly smaller it should be fine.