JohnSL, I just stumbled across this post from the Printrbot forums and am very excited to see how this turns out! I just purchased a Printrbot Simple a few weeks ago, and while it's been a great tool to get started with 3D printing, I'm quickly realizing its limitations and flaws. Being able to reuse the parts from it and easily upgrade to a delta printer like this is a great idea! I've already bby akudaikon - Delta Machines