Update Configuration.md (DraftShift#26)

Added hopefully clarification about offsets.

wiki/Configuration.md

@@ -2,19 +2,27 @@ Toolchangers start with number 0, and count up. So for all the configs, make sur
 
 1. [Toolhead Configuration](#toolheads-configuration)
 2. [CANbus](#canbus)
+3. [Offsets](#offsets)
 
 ## Toolheads Configuration
 
 Please see the repo files for more info on these. [Configuration Files Repo](https://github.com/StealthChanger/Toolchanger/blob/main/Klipper)
 
-You need to add the info in printer.cfg to your your printer.cfg
+You need to add the info in printer.cfg from the repo to your your printer.cfg
 You need to have a separate toolhead config for each toolhead, then link those in your printer.cfg, as well as removing/moving the current extruder/hotend config from your printer.cfg file. See the examples in the repo for more information and a starting place. You will have to edit them with your own values.
 
-
 ## CANbus
 
 [Esoterical CANbus](https://github.com/Esoterical/voron_canbus) this is a pretty definitive guide for canbus implementation on klipper.
 
 **Example CANbus layout**
 
 ![Example CANbus Layout](https://github.com/StealthChanger/Toolchanger/blob/main/media/can_example.jpg?raw=true)
+
+## Offsets
+
+There are 2 places to set offsets in your toolhead config files. There is gcode_(x/y/z)_offset in the [tool] section, and (x/y/z)_offset in the [tool_probe] section. These do different things. The ones in the [tool] section are always relative to a specific tool. IE, if you homed with T0, then the gcode offsets are relative to T0. When you do multi-material prints, you will have to choose 1 tool to always do the homing, even if you don't use it, because all the other offsets need to be set against it. The [tool_probe] offset is only ever applied when homing with that tool. The gcode offsets are applied when changing a tool.
+
+You should set all the [tool_probe] offsets as well though. If you are only using a single tool, you can home with that tool, and it will use the offset in the [tool_probe] section. You won't need to home with your primary tool first then before you start a print. 
+
+To try and further clarify. Lets say you have 3 tools, T0, T1, and T2. We will say that T0 is your "primary" tool. Setup the probe z_offset like you would any other printer. Make sure the offset is set in z_offset (IE, make sure when you home and go to Z0, the nozzle is actually in that spot). Its location in x/y/z is always going to be 0 in relation to the other tools. So after T0 is homed, T1 and T2 (may) need to have their gcode_(x/y/z)_offset changed so they match the location that the primary tool actually is. There are 2 main ways of doing this. You can use a test print to print layers on top of or next to each other (something like this: [Nozzle Alignment Assist](https://www.printables.com/model/109267-nozzle-alignment-assist)) or you can use a camera (something like [kTAMV Klipper Tool Alignment](https://github.com/TypQxQ/kTAMV) or [IDEX Nozzle Calibration Tool](https://github.com/Life0fBrian/Brians-IDEX-Nozzle-Calibration-tool)).