This is my custom made bracket for raspberry pi case for this case:
This case is not mine, I just made brackets for it. As you can see in the pictures, it simply bolts in place and has quick access if you need your pi (Just simply lift one side up, and it will disengage from threaded rod).
I used pi 1 in for my octo print, and you can find stl for that case on thingiverse. :)
Print in ABS for sturdier design.