Richardjm/adxl chain (#460)

* Work in progress (so no index link) for ADXL mount

* Fix readme

* Fix readme some more

* Untested prints

Clearance for electronics cover
Board closer to motor giving more wire clearance
Cleaned up CAD
Suggested JST XH

* Update CAD and fix readme

* Reorientation and re-exporting

* Should stop fiddling - added extra support bracket for chain

* Integrating with main CAD noticed there wasn't space for cover

* Update CAD image with latest design

* Add hardware to cad

* Add clearance image and design process

* Adafruit variant - untested

* Add adafruit mentions

* Add to readme for PR

* Finish of ADXL readme

* Remove WIP from ADXL readme

* Fix orientation which largely seems to be a matter of chance in Fusion 360

* PR Changes

Reduced overhang, by also removing attempt to use M3 threaded inserts for a 2.5mm through hole in the Adafruit board

* Fix readme some more

printer_mods/README.md

@@ -227,7 +227,8 @@ like so:
 | revnull | [Raspberry Pi 7inch Display Mount](./revnull/rpi_7in_display_mount) | An articulating mount for the offical Raspberry Pi 7inch touch screen | :grey_question: | :grey_question: | :heavy_check_mark: | :grey_question: |
 |Rhastlyn |[Wansview 1080p Camera Mount](./Rhastlyn/WansviewCameraMount) |A camera mount that replaces the OEM part to allow the camera to be mounted to a 2020 extrusion | :x: |:grey_question: |:heavy_check_mark: |:x:|
 | |[60mm Fan Cover](./Rhastlyn/60mmFanCover)|A easy to install cover for spec 60mm fans originally designed for a 2.4 build| :x: |:grey_question: |:heavy_check_mark: |:x:|
-| richardjm | [LED 15.5mm quarter round mounts](./richardjm/led-mounts) | Mounting corners with integrated cable runs for 15.5mm quarter round aluminium led extrusions. | :x: | :x: | :heavy_check_mark: | :x: | :grey_question: |
+| richardjm | [ADXL drag chain mount](./richardjm/adxl-chain) | Permanent mount for ADXL boards on the back of the motor, replacing the drag chain mount. | :x: | :x: | :heavy_check_mark: | :x: | :grey_question: |
+| | [LED 15.5mm quarter round mounts](./richardjm/led-mounts) | Mounting corners with integrated cable runs for 15.5mm quarter round aluminium led extrusions. | :x: | :x: | :heavy_check_mark: | :x: | :grey_question: |
 | | [Picam corner mount](./richardjm/picam-corner) | Out of the way corner mounted picam | :x: | :x: | :heavy_check_mark: | :x: | :grey_question: |
 | roboticator24 | [Touchscreen for OctoDash](./roboticator24/4inch_touchscreen_mount_for_v2.4) | Mount a 4-inch LCD touchscreen to your V2.4 in place of the usual 12864 panel to allow you to run the amazing OctoDash touch UI | :x: | :x: | :heavy_check_mark: |:x:|
 | rngSplat | [Printable Switchwire Deck Plate](./rngSplat/SW_Deck_Plate) | Print a deck plate for Switchwire with debossed Voron logo | :x: | :x: | :x: | :heavy_check_mark: |

printer_mods/richardjm/adxl-chain/README.md

@@ -0,0 +1,43 @@
+# ADXL345 GY-291/Adafruit Cable chain anchor mount
+
+**WARNING: Dupont connectors can foul with your z-chain when homing, solder wires directly or ensure you have clearance.**
+
+![The damage](Images/TheDamage.jpg)
+
+This is a mod for mounting the ADXL permanently. It moves your drag chain up by 5.5mm on the motor.
+
+From testing this mount eliminates the Z component when measuring the Y resonance.
+
+![CAD](Images/CAD.png)
+
+Check for clearance at the limits of movement
+
+![Clearance](Images/Clearance.jpg)
+
+Clearance cad check for Adafruit board.
+
+![CAD-Adafruit](Images/CAD-Adafruit.png)
+
+## Hardware
+- DO NOT USE dupont on the ADXL boards, ensure you have clearance when homing using JST XH connectors or solder wires directly
+
+### ADXL345 GY-291 board (21mm by 16mm)
+- ADXL345 GY-291 board (21mm by 16mm)
+- M3x6 BHCS
+- M3 nylon/Printed washer (optional)
+- M3 Threaded Insert * 3 or 5 (IGUS or Generic)
+
+### Adafruit ADXL345 board (1in by 0.8in)
+- Adafruit ADXL345 board (1in by 0.8in)
+- M2.5x6 BHCS (threads into plastic)
+- M2.5 nylon/printed washer (optional)
+- M3 Threaded Insert * 2 or 3 (IGUS or Generic)
+
+## Ideas that didn't work
+
+- Dupont connectors on the ADXL board are too tall and foul the drag chain when homing.
+- Attempting to use the three motor mounts doesn't work. Using the top hole would interfere with the drag chain as it's closer to the motor than the bolt. Using the bottom hole fouls the drag chain when X approaches 0.
+- Using M3x8 bolts on the board moves the board closer to the back risking fouling with JST-XH connectors - would probably be ok if soldering wires directly.
+- Attempting to not move the drag chain mounting up the motor doesn't give clearance as X approaches 0 for the board, it's too close to the bottom of the motor.
+- Flipping the drag chain mount so it's level with the top of the motor instead of moving it up just makes the radius of the drag chain tighter and more awkward to fit.
+- Trying to use threaded inserts for the Adafruit board would make the edges too thin