Scaling a model could be better

If it is parametric, I’m not aware of this. It seems more like a direct modeling program? It’s used widely by woodworkers, but not so much by 3D modelers. The appeal is ease of use. The downside is a low feature set in comparison to a program like Fusion.

You just import/export files as stl.
https://help.sketchup.com/en/sketchup/importing-and-exporting-stl-files-3d-printing

Again, if you just want to scale, I don’t think sketchup will be “easier” at all. You could even do it with something like openscad: https://all3dp.com/2/how-to-do-parametric-3d-modeling-with-free-software/

The problem is that you’re starting from an stl anyway. So “advanced” scaling that recalculates curves etc isn’t going to happen anyway. Everything will be interpolated. Which for the use case you’re describing is just fine.

Tools like 3Dbuilder or Meshmixer or just another slicer will be the most convenient. (Going through sketchup, or any other more advanced modeling tool, will definitely be an order of magnitude complexer than doing the math to go from an exact size to a percentage in Luban)

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I believe I’ve come to the conclusion that I’m just going to continue to use Cura for the workflow I’ve describe above (when I’m not permitted to modify the model). It has far more features which I may or may not need, but I’d prefer to have more options than less.

@VaughnDTaylor Honestly I hate anything Autodesk for reasons I’m not going to get into. Telling that story a venture of its own.

I really love Blender, it’s not easy to learn but it’s been around since 1994. It’s open source and there’s countless add-ons that people have made, including a parametric mode that works really well. It also has a 3D printer add-on to check to make sure there’s no errors in the model.

For slicers, Cura is my go to. You can choose what options are visible and what are not.

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