Hi Karl and everyone else building the MTU. I've finally printed my trim wheels and not to happy with the rear face where the support was. I'd like to know if those that have printed the trim wheels, the black part, if you guys used support? Is it necessary to use support on that part of the trim wheel? Also, and this is a question for Karl, I notice there are screw holes and recesses in the black part of the trim wheel and the trim handle that eludes to possibly a spring loaded function or something else but I don't see any mention of it on the build guide. Would love to hear what it was originally designed for.