- solder to the smooth side of the heated bed. The contacts should read 3, 2, 1 from left to right.
- strip the wires back a lot further than it looks like from the instructions. See the video linked above.
- the thermistor was in the same bag as the heated bed. I missed it at first.
- you want to bend the tip of the thermistor to it stick into the hole, but you don't want it to stick out of the hole on the other side. That's the surface you'll be printing on, either directly or with blue tape or a glass pane on top of it. Unlike the video, I didn't glue it in place, I just used kapton tape.
Step 8: attaching the heated bed; 5 minutes. Simple, no problems. Just make sure that the wires are facing down and at the back of the printer.