The belt holder is made to fit the Yoto Mini with a silicone case. The sling adapter was made to fit this. https://www.amazon.com/dp/B093R3VM9F?psc=1&ref=ppx_yo2ov_dt_b_product_details
I made this using PETG. My first iteration was PLA but broke when dropped. Also, the belt clip will break easier out of PLA. However, if you plan to only use the sling, PLA will probably be fine.
The author marked this model as their own original creation.