If you've recently disassembled your ERC, you'll want to reassemble it making sure the following:

  1. The left mounted motor has the belt pulley mounted high.  These pulies do not come of the motor shaft. Do not attempt to move or remove them.
  2. The right mounted motor has the belt pulley mounted low.
  3. The two motors are mounted such that their connectors face forward and away from the center.
  4. The two belts both hang freely forward of the rails.

The picture below shows the two belts mapped out and the order in which the pullies are strung.

The left motor and the belt that attaches to it will be called "L"

The right motor and the belt that attached to it will be called "R"

On the left side, the left belt comes out of the rear of the hotend assembly.

On the right side, the right belt comes out of the rear of the hotend assembly.


Begin on the left side by hooking belt L onto the motor pulley (1).  Then pull slack on the belt until you're able to loop it around the rear idler on the left y bracket. (2)


Perform the same (1) and (2) for belt R as well.


Attach belt L to (3) and then (4)

With those positions (3) and (4) attached on the L belt, you should be able to do this:


Attach (3) and (4) on the R belt as well.


Attaching (5) on the L belt will be relatively easy.

The last attachment for (5) on the R belt requires significant force to attach.  While possible to do by hand, usually a flat head screwdriver to pry it on works well.