I have several rolls of Prusament in different materials in the same color. It is difficult to keep them apart at first glance, so I built on the model of https://www.thingiverse.com/thing:4702692, but thinner so that I don't lose any printing space.
Print the Markers with Label Up and the Bracket with Label down, so you do not need Support.
For no MMU, print 2 brackets and the Markers with a Colorchange at the last Layer.
24.01.2020 added Storage for no-MMU.
The author remixed this model.