This is a long PTFE Tube spacer for 4mm OD tubes. The holes are 45mm apart. The holes are 4.5mm in diameter. This could be used as a spacer between the buffer and the spools.
This is also a part of my larger system - https://www.printables.com/model/555238-mcs-multi-color-system-for-prusa-mmu
There is a slight internal curved path to the holes (a circle of 190mm) so if placing on a hill the bumps should face up. This curve is there as most paths have a slight curve to them and this also helps grip the tubes better without making the hole narrower.
The author marked this model as their own original creation.