I'd printed out about 20 of Reivax's cases and later decided I really wanted a back. Rather than redesign something with more typical locking tabs, I designed this to press-fit into the parts I'd already printed.
a brand I don't trust and am trying to use up on things that don't matter much PLA
In the photo, the back cover is the red thing that seems to have oversaturated the sensor. Shown with a representative OLED module, a pile of the slim cases, and some more OLEDs.
I just added my code into Reivax's, using the existing parameters/variables wherever I could. So, if you change those variables, this back cover should hopefully follow along.
I did have to to change the position of the pins to locate the screen just a little (line 92 in my file):
// Dimensions between holes axis
xInterHole = 23; // was 23.7;
yInterHole = 24; // was 24.4;