MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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I'm working on adding some M3 threaded inserts - fixed in from the bottom of the dorsal motor plate - either glued, or melted in with a soldering iron. The plate can then be glued into place on the hull.
Fit the 800kv motor to it's cross shaped mount and then mount the whole lot onto the dorsal motor plate with m3 screws from the top.
The motor should be easily replaceable when something inevitably goes wrong.