RepRap for Science—How to Use, Design, and Troubleshoot the Self-Replicating 3-D Printer - Open-Source Lab: How to Build Your Own Hardware and Reduce Research Costs - page 121

FIGURE 5.24 For proper alignment, the terminators are on top of the assembly and the belt
terminators and the stage are on opposite sides of the printer.
5.2.7 Attaching the y -stage
Slide out the two smooth rods for the botom y -stage and put on two LMU bearings on each
side. Make sure the smooth rods are on top. Snap on the y -motor mount in between the double
sets of washers on the base ( Figure 5.25 ) . Mount the pulley with two M3 nuts and M3 grub
screws to the last stepper motor. Mount the motor to the y -motor mount using three M3 wash-
ers and screws. ( Note : be careful about the orientation of the pulley on the motor.)