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Good one? nope, sorry, all converters i've used were self-made and it was long ago, you can find some links in google i guess (try elitepvpers forum)

Works perfectly in Solidworks and Geomagic Design for me, I can try in Blender later if you need.

quick Goodle search gives a lot of materials about your question. Check Aniwaa, 3dinsider etc. It's too common question, need more details of what you need exactly except the price.

You can try to convert .gr2 to .obj and then export it to Blender for example

Using "cold pull" method (i've read somewhere long ago) with neylon, i'm sure cleaning nozzle with acetone will work too

wow, looking cool, especially painted i guess

$70k... never thought that it can be so expensive