Welcome Jayne,
it's true, that you can't draw 3D parts with LibreCAD.
But I know there are people out there, including me, who use LibreCAD for 3D printing.
The work flow is to draw 2D shapes in LibreCAD and then linear or rotate extrude them in OpenSCAD.
In OpenSCAD basic 3D entities like cubes, cylinders, spheres and more can be combined with extruded 2D volumes too.
Finally in OpenSCAD a 3D model in STL format can be exported for slicer input.
Imho the learning curve for pure 3D software is much tougher than for LibreCAD/OpenSCAD combo.
Armin
investing less than half an hour into Search function can save hours or days of waiting for a solution