SummaryThe E3D Hotend adds some length to the M2 extruder assembly, requiring an extension to the Z-axis Endstop. I found that the Printrbot Z Endstop Extension worked nicely but was too short. I extended the length of the assembly.InstructionsPrint as is. To install you will need to invert the Z-stop bolt and I recommend using two nuts to secure the position of the bolt as shown in the photo. Using this setup I rarely have to re-zero the print bed. And adjustments to the Z-stop is much easier.