Enclosure for RTK Postcard & Portability Shield

Has anyone 3D printed this enclosure and, if so, what material was used to allow the flexibility for the two halves to snap together? Thanks!

https://docs.sparkfun.com/SparkFun_RTK_Postcard/assets/3d_model/enclosure/enclosure.step

We used PLA and it worked fine

Wonderful! Thanks you.