It seems as though every Roku remote has different specs. And they are all vulnerable to breakage of the battery cover. So here is a replacement battery cover for the Roku Voice Remote, model RCA1R, ASIN:B0BQS9Y69G. I print it on my Bambu X1 with ABS, oriented vertically, with supports for the catch and for the bottom/end.
The author marked this model as their own original creation.