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.
Yes of course. The Plexiglas tube was just an idea as alternative to the bottle. You can find them on ebay. Some sellers cut them to the length you need and they are available in a variety of diameters and wall thicknesses.
Meanwhile I got my stackable stairs online so you can have a look.