I’ve never used a 3d printer before but want to get one. I have a bit experience in blender but not too much. My question is: How do you model for a 3d print? For example, if I want to print a hollow cylinder, I go into blender, create cylinder and delete the side faces. If I print this, the walls will be pretty thin. Do I have to make them bigger manually? and if I do so (extrude and scale) does my slicer (cura) automatically fill in the solid part?
In the case of a hollow cylinder this is something a slicer can handle from a full cylinder model. Remove the infill (inside of the cylinder) and top fill. As for software it depends what you want to create, blender is great for artistic work. For mechanical assemblies I’d throw in onshape with the other suggestions.