I switch my Abus Bordo 6000 between a few bikes, so I made a wall mount so I can hang it next to my helmet. No supports needed. Printed out of PLA without any issues.

Made in OnShape, original file here:

https://cad.onshape.com/documents/be7135c4bd9868662351fb6c/w/704a619fb2cc94c92e61ffd1/e/a856e813e3d719880d5068eb?renderMode=0&uiState=6590c8b13f63c55275dc3064