This is the top plate of the Prusa i3 X-Idler:
X idler.jpg
which is located here: Location of plate on printer.JPG

The long screw goes through this plate and activates the Z-axis endstop switch can come break out from the plate because it is too close to the edge of the plate. I have created an *.stl file of this plate and produced this:

The printed plate.jpg

The large hole is for the threaded rod to go through and the smaller, 3mm is for the long screw.

Here is the *.stl file:

Z-axis endstop block.stl


Old Man Emu