I know, PET-Bottles are not a good choice.
But more worse is ist, if you return them in a plastic bag. most of the cases, the bag isn't usable anymore and you get plluted by the arrears of limo in the bottles.
So i decided to line them up on a rope and collect them easy removeable. If you returned them, you can roll up the rope an put it easily and clean back in your Pocket. So thats kind of a Pocket tool.
- a 3D-Printer
- a rope
- a small peace of thin mdf board
- a fret saw ( my first and favorite prototyping tool ;-) )
- a rope
Get the 3D-STL-File from Thingiverse
Step 1: Print the Clips ... or Saw Them
Print the clips with a 3d Printer. If you don't have one you can jigsaw and drill them out of 3 mm thin composit wood.
they should fix the bottle neck quit tight, but not too strong.
Step 2: Assemble the Clips
Make a Knot on one end of the rope and attach the first 3 clips.
Then make another knot with a distance of 11 cm. an attach 3 clips again. Repeat this, till all your clips are atteched.
Step 3: Test It
Clip in the Bottles ..... and use it