I got hold of an old Navigo and printed a bracket to hold it on my KTM. In order to save plastic on rafting I printed some components and then bolted them together rather than print it in 1.
2 x 5mm bolts with lock nuts
1 x 5 mm bolt with countersunk head
Velcro to secure (works well I might print a clip)
Compiled in sketchup all the components are in the file.
It fits my KTM SMR950 and so far has not fallen off :)