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.
Great question! I also bought in that store, and also thought for a long time which type to order. And then I measured the width of the slot on the profile I ordered - and everything immediately became absolutely clear. I have a slot width of 8mm => I bought a "Type A".
"Type B" = 5mm, "Type C" = 6мм. See the drawing in the product description...