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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.

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If it's under-extruding, the raft could be too weak. If the nozzle temperature is too low, you could be getting blobs that catch on the cat. The difference in filaments could be responsible for either. A picture could confirm or eliminate these.