Updated Wiki content

Calibration.md

@@ -1,7 +1,8 @@
 - [Flow rate](#Flow-rate)
 - [Pressure Advance](#Pressure-Advance)
   1. [Line method](#Line-method)
-  2. [Tower method](#Tower-method)
+  2. [Pattern method](#Pattern-method)
+  3. [Tower method](#Tower-method)
 - [Temp tower](#Temp-tower)
 - [Retraction test](#Retraction-test)
 - [Orca Tolerance Test](#Orca-Tolerance-Test)
@@ -32,10 +33,13 @@ Steps
 ![image](https://user-images.githubusercontent.com/103989404/210139721-919be130-fbba-4e3a-aa58-8a563e8c7792.png)
 
 # Pressure Advance
-I will present two approaches for calibrating the pressure advance value. Both methods have their own advantages and disadvantages. It is important to note that each method has two versions: one for a direct drive extruder and one for a Bowden extruder. Make sure to select the appropriate version for your test.  
- ##### *NOTE: For Bambulab X1/X1C users, make sure you do not select the 'Flow calibration' option.*  
+
+Orca Slicer includes three approaches for calibrating the pressure advance value. Each method has its own advantages and disadvantages. It is important to note that each method has two versions: one for a direct drive extruder and one for a Bowden extruder. Make sure to select the appropriate version for your test.  
+ ##### *NOTE: For Bambulab X1/X1C users, make sure you do not select the 'Flow calibration' option when printings.*  
  ![uncheck](https://user-images.githubusercontent.com/103989404/221345187-3c317a46-4d85-4221-99b9-adb5c7f48026.jpeg)  
+
 ### Line method
+
 The line method is quick and straightforward to test. However, its accuracy highly depends on your first layer quality. It is suggested to turn on the bed mesh leveling for this test.
 Steps:
   1. Select the printer, filament, and process you would like to use for the test.
@@ -48,7 +52,27 @@ Steps:
 ![line_0 016](https://user-images.githubusercontent.com/103989404/210140046-dc5adf6a-42e8-48cd-950c-5e81558da967.jpg)
 ![image](https://user-images.githubusercontent.com/103989404/210140079-61a4aba4-ae01-4988-9f8e-2a45a90cdb7d.png)
 
+### Pattern method
+
+The pattern method is adapted from [Andrew Ellis' pattern method generator](https://ellis3dp.com/Pressure_Linear_Advance_Tool/), which was itself derived from the [Marlin pattern method](https://marlinfw.org/tools/lin_advance/k-factor.html) developed by [Sineos](https://github.com/Sineos/k-factorjs).
+
+[Instructions for using and reading the pattern method](https://ellis3dp.com/Print-Tuning-Guide/articles/pressure_linear_advance/pattern_method.html) are provided in [Ellis' Print Tuning Guide](https://ellis3dp.com/Print-Tuning-Guide/), with only a few Orca Slicer differences to note.
+
+First and foremost, when you initiate the test, you'll only see a small rectangular prism on the plate. This object serves a few purposes:
+
+1. The test pattern itself is added in as custom G-Code at each layer, same as you could do by hand actually. The rectangular prism gives us the layers in which to insert that G-Code. This also means that **you'll see the full test pattern when you move to the Preview pane**
+2. The prism acts as a handle, enabling you to move the test pattern wherever you'd like on the plate by moving the prism
+3. The filament selected for the prism is also used for the test pattern
+
+Next, Ellis' generator provided the ability to adjust specific printer, filament, and print profile settings. You can make these same changes in Orca Slicer by adjusting the settings in the Prepare pane as you would with any other print. When you initiate the calibration test, Ellis' default settings are applied. A few things to note about these settings:
+
+1. Ellis specified line widths as a percent of filament diameter. The Orca pattern method does the same to provide its suggested defaults, making use of Ellis' percentages in combination with your specified nozzle diameter
+2. In terms of line width, the pattern only makes use of the `Default` and `First layer` widths
+3. In terms of speed, the pattern only uses the `First layer speed -> First layer` and `Other layers speed -> Outer wall` speeds
+4. The infill pattern beneath the numbers cannot be changed becuase it's not actually an infill pattern pulled from the settings. All of the pattern G-Code is custom written, so that "infill" is, effectively, hand-drawn and so not processed through the usual channels that would enable Orca to recognize it as infill
+
 ### Tower method
+
 The tower method may take a bit more time to complete, but it does not rely on the quality of the first layer. 
 The PA value for this test will be increased by 0.002 for every 1 mm increase in height.  (**NOTE** 0.02 for Bowden)  
 Steps: