Until October the number was $100k or less but it is now $1,000 or less for the free version. Additionally, F360 is now a limited version in the free under $1k package. So if you make more than $1,000 annually in your hobby/business then you'll have to pony up for the subscription.As for Software, I use Fusion 360 (and there are literally 10000s of tutorials on youtube on how to design and use the software), it is free for hobbyists and start ups (so yes, you can use it for commercial purposes as long as your revenue is less than $500k a year.. I don't think that will be a problem, keep in mind, they did change the license recently, and I have not read the new license).