I love creating my own 3d designs, but i cant find anything out there that seems to be for me. I found solid works, but thats way too expensive and really i want a free software. i need to be able to design and i would love to be able to interlock the parts ie. a piston, and move it to see if there is any collisions , thats my ideal program. so whats the best for me? thanks.

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You could try FreeCad. Be sure to compile it from source and use the development version as the release is really far behind.

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Try Alibre Design! i use it to design Robot handling equipment, and can simulate movement, and it converts to STL! i thinks its £150 ish.. so good value for money!

I've just learned to use HeeksCAD in a couple of days and it is open-source/free. Probably a bit limit4d for some but it is fun finding ways to do clever things with it. You can save in a variety of formats including STL.

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