Dummy hub, chain tensioner, chain rest for mountain or road bike

Use with your rear quick release skewer
Practical thing for bike maintenance or transport
Updated :
v1 can move when the quick release skewer is in place, length 80mm (on picture 1 and 2)
v2 is static when the quick release skewer is in place, easier to print and allow to keep the spacing preventing the crushing of the frame, no need support, length 130mm
v3 = v2 with less material (on picture 3 and 4)

Comment if one size does not fit with your bike or quick release
A kinematic model could emerge