This cover for iphone xr has been tested in both versions, both in tpu and in Pla. The recommended materials are Pla and TPU 95a which I will leave you with at the bottom of the description. For printing I recommend a layer height of 0.1mm and not to use substrates or adhesion plates.If you have problems or doubts, write to me at St3d.redy@gmail.com
TPU 95a - https://rcm-eu.amazon-adsystem.com/e/cm?ref=qf_sp_asin_til&t=carpenter01-21&m=amazon&o=29&p=8&l=as1&IS2=1&asins=B07D3C93BF&linkId=80f8140e490dbee71a48f2c40340f5af&bc1=000000<1=_blank&fc1=333333&lc1=000000&bg1=ffffff&f=ifr
Pla - https://rcm-eu.amazon-adsystem.com/e/cm?ref=qf_sp_asin_til&t=carpenter01-21&m=amazon&o=29&p=8&l=as1&IS2=1&asins=B07T4X4Y88&linkId=70781e34486f0d876d0b380cd3e4d2d3&bc1=000000<1=_blank&fc1=333333&lc1=000000&bg1=ffffff&f=ifr