This  is a light mount for a 18mm diameter light. You should print in PA12 for chemical resistance. But you can use want you want. I recommend 100 percent infill at .20 layer Hight. I used 2032 3.7 volt rechargeable batteries. Here are the links for what I used.    https://www.amazon.com/dp/B07XF4SXSB?ref=ppx_yo2ov_dt_b_fed_asin_title

https://www.amazon.com/dp/B0DRJDWMM6?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

https://www.amazon.com/dp/B0CCVJHXGM?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1