Give SolveSpace a try. It's fantastic for 2D sketches and then you can extrude/revolve/subtract these sketches into other solids to build up your part. It can export to STEP or STL and then it's an easy trip through the slicer and you're ready to print!
If you're more programming minded, try out RepliCAD. Or if you don't mind dealing with Python and its build ecosystem, there's CADQuery or Build123d
If you're more programming minded, try out RepliCAD. Or if you don't mind dealing with Python and its build ecosystem, there's CADQuery or Build123d