Im at student in the US, I mostly use mmf to find models I want to print and sometimes I'll even print them, I also use mmf to enter in its competitions. I first started using tinkercad a long time ago (don't know when), I at some point started using free sketchup, and now blender where I mostly make stuff. I also use onshape to make stuff for my robotics team. I don't often post things because they aren't good, but sometimes I do.