Assembly Assistance for the Printrbot Simple - 3D Printing: Build your Own 3D Printer and Print your own 3D Objects - page 56

Figure 3.18 The Y axis assembled, and fishing line attached on one side.
Wrap the fishing line three to four times around the vinyl tubing and secure the
other end with an M3 bolt and nut, keeping the line as tight as possible.
Note
I found that wrapping loosely and using my thumb to cover the end of
the vinyl tubing prevented the fishing line from slipping off. After I had
three to four wraps, I used my fingernail to push the fishing line togeth-
er (making sure it didn't overlap on itself) while pulling on the free end
and keeping tension on the line. If you've got someone to help, the per-
son can hold and keep tension on the free end of the line as you wrap.
Whichever way you do it, try to keep tension on the line as you wrap
and secure it.
In the remaining steps, you assemble the extruder and hot-end assembly. You start
by stacking a mix of five odd-shaped parts and securing it all with three M3 bolts
as shown in Figure 3.19 .