A shelf for the Rolling Top Storage box by @GLeZz with T-Clip system by @LineArcLine.
The shelf is printed in 2 parts and then assembled with the connectors and glue.
Rolling Top Storage Box:
https://www.printables.com/de/model/65966-rolling-top-storage-box
Rolling Top Storage Box (mini Version):
https://www.printables.com/de/model/174345-small-rolling-top-box-fits-prusa-mini
T-Clip System:
https://www.printables.com/de/model/256896-skadis-t-clip-system