Options are limited since bar anchored mounts are offset, which is a shame because it is a great bar. I had been tempted to switch to a different bar/stem combo, but have decided to stay with the AB06.
I did use the Barfly that is suggested in the owner's manual, but did not love it since it does not allow for a camera mount underneath. Also, customer service for Barfly is pretty terrible.
I now use: http://www.racewaredirect.co/shop/carbon-garmin-edge-gopro-light-faceplate-mount/
Never had any experiences with a 3D printed item, but it seems pretty solid.