We did it with just the Kickstarter, so around $100k, nothing out of pocket except maybe a total of $1-2k to prototype. The "mistake" we did initially is that

We did it with just the Kickstarter, so around $100k, nothing out of pocket except maybe a total of $1-2k to prototype. The "mistake" we did initially is that we didn't account for enough extra inventory. I mean, with the KS money you have to 1) fulfill the backers, 2) create additional inventory to sell. But at a certain point while you're selling your inventory you need to start manufacturing another batch and you need money for that. Tl;dr: 3x your production costs, don't 2x them. It's not a huge issue, but that means you can do a smaller 2nd batch and you risk to run out of stock, which we did. Don't get me wrong, it's a good problem to have... it's just extra work and we could have optimized better.