BTW, many, maybe even the majority of 3d printer users don't get involved in the design process, they just download the model files and print them.
To be honest the consumer 3d printer market is still dominated by people printing toys of some kind. People designing and printing their own parts is probably only 20% of the consumer market. So there end up being a lot of people that are very good at printing things, but no idea how to design something themselves.
Then there are the guys that are better at designing than printing (like me).
Point being, you don't have to be a CAD expert to get into 3d printing, but most mechanically inclined people want to start designing their own parts in short order.
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