I designed this for 3 main reasons :

1. The power button is easily accidentally activated while mapping (e.g. when the device is in your pocket ) with this case the button is recessed
2. To add a loop to allow the Glamos Walker to be attached to a lanyard or belt-clip
3. To add some ruggedization to the the device and/or prevent damage if dropped etc. Print in TPU with < 50% infill (this gives a more cushioning effect) orient bottom side on the plate (the side with most surface area) The overhangs on the top surface should print OK without support with good settings - It also helps if the ambient temperature is very cold when printing :-P