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.
Got these printed at a local 3D printing shop using black PLA with 20% infill. It came out with some "elephant footing," making the bottom edges flare out wider than designed. It wouldn't fit first try. The internal profile came out the right size though. I just had to shave down the three "clips" in the rings with a sharp modeller's knife to get it to fit. Try that if your print isn't fitting properly. Also remember to take off the existing rings before putting on the new ones!