The item can extend the MMU Buffer (inspired by RMU Buffer) by 10cm. This can be useful if you have a longer PTFE Tube between MMU and Printer, for example if you're keeping the MMU out of the enclosure. A longer PTFE tube needs a slightly bigger buffer to accomodate the extra length of Filament.
You can use multiple of this extender to reach the desired length.
29.01.24: Updated with rounded corners
The author remixed this model.
With my model you can extend your existing buffer by 10cm if you have a longer PTFE tube between MMU and printer