I've uploaded some STLs for WWII British cruiser tanks for the desert war in North Africa to Wargaming3d
The Crusader II, with and without the MG sub-turret, and with the turret buttoned-up or open (you will need to provide your own commander figure)
https://www.wargaming3d.com/product/a15-crusader-ii/... and the Crusader III
https://www.wargaming3d.com/product/a15-crusader-iii/The models have been created at 1:100 scale for 15mm gaming, but I think they should scale up easily enough. Scaling down might be more problematic for FDM printing, as the 2pdr gun is a very slender item already. For 1:150 or smaller, I would probably just replace it with a short length of wire.