Can I ask where you pick up the stls for battletech printing?
My three primary sources are Cults3D, GamBody, and Thingverse. Thingverse used to have deep catalog of Battletech stl's but around 2021 they purged a lot of it out sadly. I should also point out some of the people on Cults3D do charge for access to their work; and pretty much all the files on GamBody are not for free.
My secondary source is Facebook surprisingly. There's a lot of people that display their work on the various groups there and they will often enough link their stl's when the post. Even when they don't, you'd be surprised how much polite and discrete message to the creator will get you.
My final
source is a guy in my local gaming group with a Telegram account. I honestly have no idea how it works and how he gets the files from it but hey it works. On the train of thought, it some times doesn't hurt to ask your local group or even a Discord if they know where they can point you.