This is a 3D-printed mount / holder for the very good Chinese bicycle light Cree XM-L T6. My intention was to create a holder which is fixed UNDER the handlebar stem. With this design you have more space on your handlebar and the beam angle of the light is still adjustable.
Other parts you need: You need a o-ring rubber for fixation.
Note: I only printed V2 (asymmetric), because you can print it without any support.