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lol - I use windows 7.
The best version. Most people don't realise that you don't need to have windows 10 :-)

loading an obj into tinkercad and exporting to an stl works fine. Plus I'd need to...

don't use windows 10. so that's out :-)

Installing windows 10 to get 3d builder is like cutting your own leg off because you fancy making prosthetics.
I'll see if tinkercad will import an obj...

Added the dots :-)

Looks interesting, and the basic version is Free !
Which as everyone knows, is my favourite cost of anything :-)

I need to make 3d faces on spheres, and doing it on...

the old cura was quite good. But then they completely redesigned it and since then it's been really horrible.

The last user friendly version was: 15.04.6
here's a list of al releases: ...

blender is a popular free one.
As is tinkercad.

I like openscad, but then I can't draw freehand :-)