Universal phone necklace support

I've seen phone cases going around with necklaces to wear your phone around your neck, my mom has been looking for a case like that for her phone for a while and hasn't been able to find anything, she even ordered one on aliexpress and got scammed (it's for the wrong phone, had no pics on the ad), I got a universal elastic strap but it would cover some parts of the screen so i decided to design something that goes in the back of the case so it's not covering the screen or even visible outside of the part that goes out of the case, this will work with any ordinary lanyard or necklace that can support the weight of your phone, I'll leave the .step file in case you need to make adjustments for your phone, this was tested on a vivo v40 and a redmi note 12 pro+, size is 70mmLx30mmHx0.5mmW for the part that goes in the back, and it should fit most phones

I'd recommend printing at a low layer height and full walls for a better durability, this was printed on a sovol sv06 using anycubic filament

EDIT: USE TPU, OR IT WILL SNAP, tested