Update README.md

README.md

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-# Creality Ender 3 Pro
+# Hardware
+## Specs
 **BTT SKR Mini E3 V2.0, direct drive, and BL-Touch - Raspberry Pi 4 running Klipper & Fluidd**
 
 I'm collecting information here to track progress on setting up an Ender 3 Pro that I pulled out of the trash. The previous owner had already upgraded the motherboard and completed a changeover to direct drive. The Z-axis was initially bizarrely overtightened, causing MAJOR skipping issues that squished all the prints about 30%.
@@ -12,6 +13,15 @@ After properly torquing the eccenctric nuts on the Z-axis and other belts as wel
 
 Before getting into the printer itself, let's go over how to connect to the Pi, which is running the whole show.
 
+### Built Plates
+I have two build plates for this. The stock one from Creality with the crappy magnet on the back that feels like an up-jumped refrigerator sticker, and a fancy-pants PEI sheet. 
+
+The PEI sheet doesn't work for shit. It works beautifully on my other printers but on this one I genuinely can't get anything to stick to it. I'm certain it's either a bed leveling or Z offset issue, but the crappy sheet that came with the machine, all scratched to shit, works much, much better.
+
+## Problems?
+###Non-functional/detrimental bed meshes
+Bed meshes don't seem to work properly. I can get wildly different bed meshes without ever moving or adjusting anything on the machine, leading me to believe that the BL-Touch probe might have some issues (or may not be a genuine part, I'm not certain.) It might be worth looking into something else for Z probing. 
+
 # Raspberry Pi 4
 **Overview**
 <pre>
@@ -94,3 +104,7 @@ See the Git for documentation. You probably won't need to do much through this u
 ### Other
 
 This is running a Debian-based OS. Because of this, you can update using <code>apt</code> just like on any other system. Everything that is currently installed is actively maintained and should work great through updates. On my other 2 printers running Debian w/ Klipper, updates have gone off without a hitch. 
+
+# Firmware
+
+The printer is running Klipper ([GitHub repo](https://github.com/Klipper3d/klipper)).