various bambu, bangle, and arch additions

hardware/incubating/bambu_p1s/README.md

@@ -10,4 +10,16 @@ If you want to set up WiFi without logging in follow this:
 
 ### Connecting via LAN mode
 
-- Make sure you open 1990 and 2021 in your firewall application.
+- Make sure you open 1990 and 2021 (tcp + udp) in your firewall application.
+
+### Troubleshooting
+
+#### Under Extruding
+
+I've had an issue where prints will look "clumpy" or "rough". This was resolved after a complete
+hotend swap. I did some testing on the bad nozzle before replacing it and found it could still
+extrude decently but I had to raise the temperature 50-60°C above 220° to get the plastic flowing
+well. I don't think the ceramic heater was broken since the nozzle was clearly heating just fine.
+This leads me to believe the thermistor went bad or became disconnected from the nozzle somehow. My
+guess is Bambu didn't use enough thermal compound at the factory and it became dry and cracked,
+creating a layer of air between the thermistor and the nozzle.