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 107

Then follow Figure 5.9 for the idler end botom rod (idler side): washer, nut, nut, and wash-
er. Mount rods to the frame with a washer and a nut on each side are shown in Figure 5.10 . It
does not mater which side at this point of the build. Again, remember to leave the assembly
loose at this point—tightening will take place later.
FIGURE 5.9 Assembly of the idler end bottom rod (idler side) for the y -axis.
FIGURE 5.10 Mounted y -axis rods to the frame.
5.2.5 The z -axis (up and down)
First, obtain all the z -axis components shown in Figure 5.11 .