What is your "inexpensive" hobby that turned out to be expensive/ you gradually invested lots of money into?
Edit: so it turns out that every hobby can be expensive if you do it long enough.
Also I love how you talk about your hobby as some addicts.
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I have been trying to get into 3D printing! It sounds so cool! Can't you connect your printers to the cloud so that other can print using your setup? Maybe you can charge for their usage based on your costs.
I don't think you read the last paragraph :(