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 129

FIGURE 5.31 Installed print bed (mirror precut to size) on top of your bed and held in place
with four small binder clips.
5.2.8 The extruder
Gather the BOM as shown in Figure 5.32 for the extruder:
Wade's gear big and small.
One extruder body.
One spacer.
One extruder mount.
One hot end mount.
One motor spacer (thin).
One Bowden sheath 2 ft long (8 inch OD, eigth by a quarter ID, PTFE tubing).
Two M6 nuts.
Three 608 bearings.
Five M8 washers.
One M8 locknut.
One Hobbed Bolt.
One-inch threaded rod idler shaft.
Four M4 × 50 mm screws.
One Budaschnozzle 1.2 0.5 mm(LulzBot).
Four springs.
Six M4 nuts.
Ten M4 washers.