Replacement elastic cord for outside tap frost protector

The elastic cords holding my two outside tap frost protectors perished and left me with no way to hold the frost protection covers on the taps. I copied the shape and size of the original cords and printed in TPU. Having printed the cord, I discovered that it wouldn't fit through the original bung (the liner for the hole in the polystyrene cover), and so I designed and printed two new ones. Then I discovered that the cord lock was missing from one of the covers, so I designed a thing a bit like a camping guy rope tensioner and printed that.

The cord is a very tight fit through the bung, relying on the 600%-elongation-to-fail of the TPU, and needs lubricant to help it slide through. I used SuperLube with one and washing-up liquid with the other - both fought back!

I hope that you can work out from the photograph how I threaded the printed lock onto the cord. It's not necessary to fit it this way but it is more compact.

Print Settings

Esun TPU (shore hardness 95, although probably not that important!)
0.6mm nozzle, 0.2mm layers, no retraction, no crossing perimeters.

Cord: 3 bottom layers, 3 top layers, 5 perimeters, 100% concentric infill, concentric bottom, concentric top.

Bung: as for cord, except 20% triangle infill.

Lock: 2 bottom layers, 2 top layers, 3 perimeters, 20% honeycomb infill, rectilinear bottom, rectilinear top.