ADXL345 Chain Anchor mod (#386)

* add ADXL345 Chain Anchor mod

* Spelling

* fix insert amount

* remove spaces from filenames
fix some markdown warnings

* didnt actually test it on 1.8 and SW

* Adding the change requests from @KiloQubit

* Rotated stl to a printable orientation

* Readme file formatted

* typo in Markdown file

Co-authored-by: Padok <padok@disroot.org>
Co-authored-by: louis.frank <lfrank@dpz.eu>

printer_mods/README.md

@@ -189,6 +189,7 @@ like so:
 | |[RPI Metal DIN Mount](./Oakman/RPI_Metal_DIN_Mount) | Adapter for metal DIN mounting the Raspberry Pi |:x:|:heavy_check_mark:|:heavy_check_mark:|:x:|
 |ommy | [roller brackets](./ommy/roller_brackets) |Brackets to help rolling V2 on its side. |:x: |:x: |:heavy_check_mark: |:x:|
 |oxno | [RBP Zero Bracket](./oxno/rbp_zero_braket) |Bracket for Raspberry pi zero. |:x: |:heavy_check_mark: |:heavy_check_mark: |:grey_question:|
+|padok |[Chain Anchor - ADXL345 mount Mod](./padok/chain_anchor-ADXL345_mount) | A ADXL345 mount for the Afterburner |:x: |:grey_question: |:heavy_check_mark: |:grey_question: |
 |Phalanx |["Other" Idlers Mod](./Phalanx/Other-V2-Idlers/) | Allow usage of wider toolheads on the V2 |:x: |:grey_question: |:heavy_check_mark: |:x:|
 |piet206 |[V1.8 Z Rails Mod](./piet206/V1.8._Z_Rails_Mod) | Add MGN12H linear rails for Z axis motion |:x: |:heavy_check_mark: |:x: |:x:|
 | Printopal | [Magnetic top panel](Printopal/Magnetic_top_panel) | Top panel with magnets allows for quick installation and removal | :x: | :heavy_check_mark:| :heavy_check_mark: | :x: | 

printer_mods/padok/chain_anchor-ADXL345_mount/README.md

@@ -0,0 +1,56 @@
+# Chain Anchor - ADXL345 mount Mod
+
+![Chain Anchor](img/VORON2_v2.4_Assembly_-_Chain_Anchor_-_IGUS.png)
+
+Recently I started exploring the input shaper feature of klipper. Unfortunately I had to realize that it is not so easy to attach the ADXL345 in such a way that useful measurements can be collected.
+Therefore, I have created this mod, some drawings are of course still WIP but I think I have reached a stage where it is useful to get feedback.
+
+## Construction
+
+I downloaded the CAD files of the Afterburner hotend and searched for a suitable place to put the ADXL345 adapter board. I found the Chain Anchor on the backside, which offered exactly the right amount of space for my purpose.
+
+![Chain Anchor](img/VORON2_v2.4_Assembly_1.png)
+
+I printed the part on my printer using eSUN ABS+ Black/PeekGreen like all the other parts, but this one was unfortunately a little bit overextruded.
+After adding the threaded inserts, I sanded the plateau with some P180 sandpaper that I placed on a flat surface to ensure the best possible contact surface for the adapter board.
+
+![Chain Anchor](img/IMG_01.jpg)
+
+After adding the ADXL345 it should look something like this:
+
+![Chain Anchor](img/IMG_04.jpg)
+
+![Chain Anchor](img/IMG_05.jpg)
+
+After that you can use this part as a replacement for the standard chain anchor.
+
+![Chain Anchor](img/IMG_06.jpg)
+
+## BOM
+
+| #   | Part                                               |
+| --- | -------------------------------------------------- |
+| /   | Afterburner: Chain-Anchor Parts                    |
+| 4   | M3 standard Voron Threaded-Insert                  |
+| 2   | M3x6 Screw                                         |
+| 1   | ADXL345 - Triple Axis Accelerometer Breakout board |
+
+## Klipper config
+
+```EditorConfig
+#####################################################################
+#  G Sensor definition
+#####################################################################
+[adxl345]
+cs_pin: PIN_CS
+spi_software_sclk_pin: PIN_SCLK
+spi_software_mosi_pin: PIN_MOSI
+spi_software_miso_pin: PIN_MISO
+axes_map: x,z,-y
+```
+
+## Example data
+
+![calibration_data_x](img/calibration_data_x.png)
+
+![calibration_data_y](img/calibration_data_y.png)