V0 DC inlet mod (#272)

printer_mods/README.md

@@ -40,6 +40,7 @@ like so:
 |arkeet|[Dial test indicator mount](./arkeet/dti-mount)|A toolhead mount for a dial test indicator, where the tip is located at the nozzle. |:x:|:heavy_check_mark:|:heavy_check_mark:|:x:|
 | |[Magnetic hotend fan cover](./arkeet/magnet-fan-cover)|A replacement hotend fan cover, held with magnets instead of screws. |:x:|:heavy_check_mark:|:heavy_check_mark:|:heavy_check_mark:|
 | |[MGN12 X-axis](./arkeet/mgn12/)|Replaces the dual MGN9H rails with a single MGN12H. |:x:|:x:|:heavy_check_mark:|:x:|
+| |[V0 DC inlet](./arkeet/v0-dc-inlet/)|Skirt inlet for external 24V DC power supply. |:heavy_check_mark:|:x:|:x:|:x:|
 |claytono|[Voron 2.4 Extrusion Jig](./claytono/2.4-extrusion-jig)|A jig help align extrusions to get a properly square frame |:x:|:x:|:heavy_check_mark:|:x:|
 ||[V0 Zip Tie Skirts](./claytono/v0-zip-tie-skirts)|V0 skirts with small loops added along the top to allow zip tyiing cables to them|:heavy_check_mark:|:x:|:x:|:x:
 |Badnoob |[Precision AB Drive](./Badnoob/Precision_AB_Drive)|Changes the gearing for the AB drives to improve both resolution and torque, with a strenthened frame. |:grey_question:|:grey_question:|:heavy_check_mark:|:x:|

printer_mods/arkeet/v0-dc-inlet/README.md

@@ -0,0 +1,55 @@
+Voron 0 DC inlet
+============
+
+Adds a skirt-mounted inlet and switch for an external DC power supply, to
+allow using a DC bed.  Options are provided for rear or side mounting.
+
+BOM
+---
+
+- Kycon KPJX-PM-4S connector
+  [(Digi-Key)](https://www.digikey.com/en/products/detail/kycon-inc/KPJX-PM-4S/9990081)
+- Mean Well GST160A24-R7B power supply
+  [(Digi-Key)](https://www.digikey.com/en/products/detail/mean-well-usa-inc/GST160A24-R7B/7703602)
+- Power switch, 20mm round, rated for at least 7A at 24VDC [(Digi-Key)](https://www.digikey.com/en/products/detail/w-rth-elektronik/471002268142/9950821)
+- 2x quick disconnect terminal for power switch [(Digi-Key)](https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/2-520194-2/289254)
+- 24V 60W bed heater
+  [(Keenovo)](https://keenovo.store/collections/standard-keenovo-silicone-heaters/products/keenovo-square-silicone-heater-3d-printer-build-plate-heatbed-heating-pad?variant=33194097803404)
+- 4x M2x10 self tapping screw
+- (For rear skirt only) 4x M3x6 BHCS + 4x M3 hex nut
+
+With a 24V bed the SSR is not used, and the bed heater is directly connected
+to the bed heater output on the controller.  I suggest using a SKR Mini E3
+V2.0, which can control 2 heaters and 2 fans (unlike V1.2, which has only 3
+controllable outputs).
+
+Instructions
+------------
+
+For rear mounting, print both `skirt_rear` files and `inlet_bracket.stl`.
+Mirror the skirt pieces if you want the inlet on the right side.  Each piece
+mounts to the rear vertical extrusions with two M3x6 screws.  The rear deck
+panel must be removed.  Temporarily remove the rear panel and rear feet to
+access the extrusion slots.
+
+For side mounting, print `skirt_side_with_inlet.stl` and `inlet_bracket.stl`.
+It replaces an existing skirt piece; mirror it in your slicer if desired.
+
+Inlet and switch mounting steps are shown below.  It is suggested to solder
+wires to the inlet before assembly.  Pay particular attention to the order of
+the inlet pins, and confirm with a multimeter.
+
+Images
+------
+
+![Rendered](Images/render.png)
+
+![Photo](Images/photo.jpg)
+
+![Assembly](Images/assembly1.png)
+
+![Assembly](Images/assembly2.png)
+
+![Assembly](Images/assembly3.png)
+
+![Wiring](Images/wiring.png)