How to straighten corrugations on a plastic bottle

There are many options for crafts from PET bottles, often corrugating on the surface makes it difficult to carry out the idea, and in order not to look for containers of the desired shape, you can straighten what is already assembled.

To adapt, you will need a sewer pipe with a diameter of 100 mm, which must be cut lengthwise to give the desired shape. With PET, the bottom and the bottom are cut off, then the cut pipe is put inside. Thanks to the effect of heat shrinkage, the packaging takes on the desired shape when heated.

For crafts, you can adjust the diameter of the inner pipe and thus make the same workpieces from different containers.