Was fooling around a bit and created this for all you weight conscious cyclists. It is not in my shop but is available to anyone who has or has access to a 3D printer. It is a combination stem cap and M6 Bolt. It cannot be used to preload the headset bearings, but is ideal for anyone wanting to shed a few grams of weight.
To make it easier for people to use and modify I have included the IGES and STEP files for modifying.
Low Profile Stem Cap - Youmagine
Fancy Bicycle Stem Top Cap (now includes IGES & STEP files) by WheresWaldo - Thingiverse