Summary

Yet another take on a printrbot x axis extension.
I wanted to reuse the original plate, but still be able to use 400mm rods so later extensions are possible.

Instructions

Print the left endstop and the two plate holder parts.
Replace the original rods and belt with longer ones.
Attach the endstop to the end of the rods with strips.
Similarly, attach the two plateholdes to a rod each with strips, and attach them to eachother with another strip. The head of the strip should point down, as this is what will hit the x-axis endstop.
Attach the plate to the plateholders with the original screws.
This extends the build area to 130x100.
You can now print the right endstop and replace the original with this (similarly to the left endstop), which will extend the area to 150x100.

PrintrBot Maker 1405 x-axis mod