start with a budget for a printer - until you know how much you can spend you can't start looking at printers.

Also, before you think you can start a business - do some market research.
I've just not bothered renewing my 3d hubs page, after 2 years not a single thing.

Done some bits for local people, but once you explain that yes you can make that widget. But as it'll take some hours of designing and printing it won't actually be 50p, they tend to go away.

If you have a specific thing people want to buy and can't currently get - then you might have a chance.

But with any business proposition - start with your setup budget and come back to us :-)