Does anyone know if there are any Screw thread CAD models available to download, in order to cut threads into parts for 3d printing?
What version of SolidWorks do you have?
What is your desired thread specification? (With this information it is pretty easy.)
We're currently using SW2014
McMaster-Carr has plenty. You will have to adjust sizes to suit shrinkage & filament thickness.
J. B, since you are wanting female threads you should just make a helical thread feature on your holes, either a cut or a boss depending on what your starting hole size is. This would be better than doing a cavity subtraction. (Be careful of using McMaster-Carr threads anyway as I've actually seen some that had staggered grooves and even a left hand helix instead of the proper right hand thread.)
As Kelvin Lamport stated you'll need to allow for the shrinkage and resolution of the 3D printer. Personally, I would tap the threads instead of printing them. I would model a smaller than normal pilot hole, then once the part is printed drill it to the proper size and tap the hole using a fresh, sharp tap.
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