SketchUp was my go to for a while but I'm done with parametric personally, trying to fix meshes for 3D printing... time I grow up and use something like Fusion360 seems like or onshape. Still it was good/simple enough for non-round shapes in SketchUp except they have some kind of memory leak/bug at least for the 2017 version. But I guess quit being cheap and buy a modern copy on my part.
Edit: oh I guess sketchup is a surface modeler weird thought it was parametric this whole time, lol someone else said it's a polygon modeler
Yeah I don't know what parametric modeling is apparently, I use a mouse/calipers to model stuff not parameters
There is a solid validator plugin you use before you export an STL to make sure the mesh is closed/a manifold
Edit: oh I guess sketchup is a surface modeler weird thought it was parametric this whole time, lol someone else said it's a polygon modeler
Yeah I don't know what parametric modeling is apparently, I use a mouse/calipers to model stuff not parameters
There is a solid validator plugin you use before you export an STL to make sure the mesh is closed/a manifold