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Hi Daniel, awesome project. We are in the process of building one in company colors on the Ultimaker we have here and pretty much all the parts are printed now. Only, we are a bit at a loss for the engine choice. The link on Thingiverse is dead but a similar motor seems to be 1855kV (150W). Yet the pictures supplied by 3DPrintnpack show a 3100kV (255W) motor. Which one is correct? We don't aim for top speed since this will be an office racer but we do like to keep things in one piece (and the magic smoke inside the electronics). Thanks!