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 141

FIGURE 5.44 Bill of materials for the electronics.
If you have never soldered before, now is your chance to learn! I recommend trying to solder
two wires together first to get the hang of it. Solder the wires together tinning the surface first
and do a but joint.
When you are ready, cut the thermistor leads to have one slightly shorter than the other (a
few millimeters). Get 3 ft of two conductor wires. Then cut your conductors to the same length
diference. Cut 1 cm of heat shrink tubing to completely cover the first lead and a slightly lar-
ger diameter heat-shrink tube to go over the first and the other wire. String them both on the
wire. Strip about 0.5 cm of wire and overlap the thermistor leads with the wire. Solder the wire
to the thermistor lead by tinning the surface irst—do a but joint. Put the irst heat-shrink tube
down and use a lighter or heat gun to shrink it. Then solder the second wire. Finally put the
longer heat-shrink tube down over the second wire and first heat-shrink tube—and shrink it
in place with the lighter or heat gun.
Now it is time to begin building the electrical system. Screw the Melzi mounts onto the
Melzi board with M3 screws, bolts and washers. Mount the Melzi board to the right of your
printer on the far side of the extruder using zip ties as shown in Figure 5.45 . Next, solder 3 ft
of wire to the thermistor (orange) epoxied to the heated board and solder 3 ft of wire to the
front metal contact on the heated board as shown in Figures 5.46 and 5.47 .