Richardjm/back plate (#482)

* Rough and ready back plate design

* Fix incorrect image markdown

* Add newline

* Words, use the right words

* Improved CAD, many depths, better instructions

* Add blanking plate to readme

* Missing newline

* Fix PR - 4mm version and typos

Must have been tired

printer_mods/README.md

@@ -228,6 +228,7 @@ like so:
 |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 | [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: |
+| | [Back blanking plate](./richardjm/back-plate) | Back blanking plate that can be used instead of the exhaust filter housing if you are using something like a nevermore filter instead. | :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:|

printer_mods/richardjm/back-plate/README.md

@@ -0,0 +1,27 @@
+# Back plate blanking plate
+
+If you choose not to use the exhaust - perhaps you're planning on fitting a nevermore instead. This is a blanking plate with integrated bowden tube route that goes in place of the exhaust filter housing.
+It makes use of the existing grill with one strut removed (use the stl here or cut out a strut of a grill you already have printed) as I liked the look of it.
+
+![The CAD - outside](Images/CAD1.png)
+
+![The CAD - inside](Images/CAD2.png)
+
+## Instructions
+- Choose the appropriate blanking plate, the depth should be that of your back plate including the foam (distance from the flat of the extrusion to the flat of the back plate)
+- Put foam on the edges of the blanking plate that contact the back plate and extrusion
+- Cut out a strut from the exhaust grill or print a new one
+- 2 x M5x16 (for the 5mm variant)
+- 2 x heatset inserts into blanking plate
+- Existing M5 T-Nut and M3x12 bolt from exhaust filter housing
+- Ream the bowden path and push the tube through, it is a tight fit
+- Thread the tube through the grill before attaching to your extruder, not that I would have done that, oh no
+- Tighten it all into place
+
+## Installed
+
+![The outside](Images/Outside.jpg)
+
+![The inside](Images/Inside.jpg)
+
+Ignore the missing m3 screws holding the grill in place, it's because the led bar interferes.