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Ok, I understand!
The "Print Cooler" it is not intended as belonging to the "core" of Dondolo, (the X-Carriage itself is on the "borderline"!).
Among the Dondolo files the PP4 is named "Extruder_Chain_Support_v2.stl" and is slightly different.
The PP4 part referred in the "Assembly Guide" (and the X_Carriage) is uploaded in the project:
http://www.thingiverse.com/thing:1017953 (Prusa i3 Hephestos Dondolo Upgrade Kit.

I hope this will help you.

Ciao,

Gianni.

Prusa i3 Hephestos Dondolo Upgrade Kit