Taken at face value, this is engineering negligence. I've done industrial design with plastics and 3D printed parts. Regardless of the forming techniques, with plastics you still need to consider properties like minimum melting temperatures, tensile stress, and so forth. Then you must test that rigorously. This is all standard procedure. That information is in the data sheet for the material.

I did a quick search and found that many plastics are governed by ISO 11357 test standard [1]. Some of the plastics I have worked with used this standard.

A spec sheet for that material is here [2].

[1]: https://www.iso.org/standard/83904.html

[2]: https://um-support-files.ultimaker.com/materials/1.75mm/tds/...