I couldn't find any hex bases that matched the ones in the Game of Armored Combat box, so I decided to make my own.

They should be pretty close, but the inner dent is shaped a little differently (to make it easier to print).

These are scaled for Classic Battletech (6mm). If you're looking for Dark age/Clickytech scale (10mm), just increase the horizontal size by 40%.

If you're using an FDM printer, orientation should be topside down (like shown in the model preview). If using DLP/SLA, the model should be angled so that one of the sides is flat against the plate (so that it's mostly vertical). Either way, supports shouldn't be needed.

[Updated 20-03-04 - I changed the angle of the inner wall to more closely match the official bases, and increased the thickness of the platform]