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Thanks for the design! Printed fine on in PLA my M3d Micro. I would recommend that the shell should be rotated 90 degrees for printing. I.e. lay flat on the print bed, instead of building upwards. This is because both shells snapped when I pushed them onto the core, they bent outwards along the layer lines and snapped at the weakest layer.

If they were printed oriented the other way, they would bend across the layer lines instead of along them. Should be stronger that way. Some support might be needed to that cutaway section.

I welded them back together with a soldering iron anyway, so it all works fine.