MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
It depends on where you live. In Australia I get that spring (No#181) at Bunnings. You'll also find that spring (#651) in most hardware stores in North America. Outside of that you'll need to take the specs from the spring and match it up with a local supplier of springs. It's a very common spring so you'll definitely find something close nearby. If you do find a substitute locally then please post the link here so others can benefit?