Remix of https://www.thingiverse.com/thing:857803 by @abuharsky. Added two holes for zip ties (as you want to have the light on the way home) and with smaller interlock for common LED lights with bottom stop. – Very handy solution when you have telescopic seatpost without space to mount anything on it.
Print it with 4+ walls and dense infil (40% honeycomb is OK) from PET-G, ASA etc. PLA is too brittle and relaxing.
The author remixed this model.