My FPV goggles have no internal battery, they need to be run off a 2s-8s LiPo or 5v from a USB port. This lets me use a reasonably safe power supply instead of strapping a raw lipo to my body.
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Freecad?
FreeCAD, not the easiest but I like it.
I use it too. I'm now learning to cope with how it doesn't have a tool for external threads
I just use the helix pad and a triangle.
As @nik282000@lemmy.ca mentioned, a helix is one way, but if you want to make it easy, just go to the Addon Manager and install the Fasteners Workbench.