Drinks Bottle Carrier

This is an adapter to allow most standard small plastic bottles to be carried via a lanyard or similar. It was based on an idea I saw in a charity shop but it turned out that the shop version only worked with their range of (uneconomically expensive) bottles. You simply print out two halves of the adapter and bolt them together with two M3 x 12mm screws and nuts. The third hole is for a key-ring loop which you connect to a lanyard.

The design is in FREECAD so can easily be customized.
Print at 0.1mm resolution, 20%infill. You probably need to add a brim to prevent lifting of the corners during printing. I made mine from PLA.

(Remember to print a mirror image of the STL for the matching half)