Free/cheap prototyping & simulation (w/physics) apps for creating 3D printed robots?

Looking for something that lets me build and (to whatever degree of realism) simulate a robot made with common components / servos / materials, ESPECIALLY something that simulates electronics / PCB behavior. If it could even go as far as emulating a raspberry pi / nvidia jetson that’d be cool AF.

Would prefer open source / free for personal use apps – Fusion 360 looks like what I am after at first glance but I ran away as soon as they mentioned crippling the app in various ways for personal usage….
If I really need to go that route, though, or if you know of something that covers some but not all of the bases, do let me know! I am trying to steamroll into robotics + 3D printing and your experience helps me get there that much faster.

submitted by /u/thrillux
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