I think you can develop a product and run a business at the same time. E3D, Prusa etc. did it before they grew a bit bigger (both still relatively small companies). Where a lot of kickstarters go wrong is they are stupidly optimistic, assuming nothing will go wrong and no hidden costs will pop up. Naturally, they run out of money.

Another common trap is trying to offer the kickstarter backers a discounted price for what will be the first production run, which is usually the most expensive per unit(due to set up costs, R&D, tooling). Charging less money for what will cost you more to make doesn't make sense.

A lot of kickstarter engineers look like they're fresh out of their degree, and have precisely jack all experience with actual products and their development. That or they aim too high for a startup. Go for a working product, add bells and whistles later (for a consumer targeted printer, this kind of ongoing support and upgrades is a big plus and attention grabber), you're not a big company with resources out the wazoo.