Made mine of black, red and transparent PETG. I have to experiment a little more with the transparent one, because the refractions resulting from spaces between the layers make it look cloudy. I tried UV curing resin, but the resin will heat up a little while curing and the part gets warped.
PS: It seems, there are no other batteries on this world than Eneloops :D
I'll make a remix soon, a little flap at the corners of the side pieces to hold the batteries in place, when you move the entire thing around.
black, red, transparent