Summary

Instruction:

1. Print it flat - as it is modelled. I printed it with PET-G, with support. Likely without support it should be good as well.
2. using hot air gun (temp 250*C) heat up "flapes" and bend them - as you can see on the picture.

Important! do not heat whole part, just heat it in the place of bending

part works great with some aliexpress headlight with 18650 battery holder. Original part broke down completely.
Will see how long printed part will do, at least I can always print a new one!