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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Small dab of hot glue in each four size is good but just watch out with the weight.
If the propeller "pitch" size was not right for the motor you will not get enough lift. Did you bought the propellers match recommended with motor specification?