E-Flite Apprentice Motor Mount
A friend with an Apprentice needed a bulked up motor mount to replace the much more fragile stock part. This is an exact fit compared to the OEM part (same hole paterns and spacing, same motor standoff length and angle, etc.), but with thicker bracing and a few of the superfluous holes deleted.
I printed in ABS on an MBI 2X @ 100% fill with 3 shells & .20mm height using MakerWare / Skeinforge. It's considerably more rigid, not too heavy and everything bolted right up.