I would say this is an ideal is a good start with passion.
However, it doesn't mean it is a good idea.

What triggers you to kicks start doesn't mean you will end up doing the same.

Why do people buy from you? Only if your products solve their problems. Do you think nail designs worth or nail 3D printed is what the customers are buying or buying both?

Selling nail designs can be a tricky one - you are selling designs or selling intellectual properties? The designs can be stolen, while intellectual properties will be harder. So how to build and test the intellectual properties (which can be visible and invisible types)?

Next, how can you ensure the fulfilment of the order? Shouldn't you need to test the process flows and decide on who to partner with to cover the gaps you lack?

The list goes on ... what I like to highlight here is to test an idea, you need to cover the testing holistically so as to ensure your next move from Startup to increase $ and time to grow a business is a smooth sail.

Concept/ idea (make sure you cover all the above) => try evidence-based testing, logic test, stress test, and survey.