This perfectly spaces the control box from the CR-10. Not too far, not too close that it gets hit by the X bar.
Meant for placing the control box to the left of the printer.
I printed this at 20% infill PLA no issues. Print speeds at ~80mm/s took 1hour 4minutes.
This should fit no matter how bad your printer's tolerance is. I gave it a little less than 1 mm of extra space.
I recommend printing two, but one would work just fine.
EDIT: Just increased the length of the CR-10 holder piece and the thickness of the model as a whole by 1 mm.