V2.4 alignment jig by claytono (#163)

printer_mods/README.md

@@ -28,6 +28,7 @@ like so:
 |aeresov|[TL filament sensor bracket](./aeresov/TL_filament_sensor_bracket)|A bracket for TL filament sensor to mount near stock spool holder. |:x:|:grey_question:|:heavy_check_mark:|
 ||[MeanWell UHP-xxx DIN mount](./aeresov/TL_filament_sensor_bracket)|A bracket for MeanWell UHP series PSU (200, 350 and 500) to mount it across 2 DIN rails.|:x:|:grey_question:|:heavy_check_mark:|
 |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:|
+|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:|
 |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:|
 | |[Rail Alignment](./Badnoob/Rail_Alignment)|Tools and procedure to properly align the rails in 2.4 and Afterburner|:x:|:x:|:heavy_check_mark:|
 |BlueBear|[Deck Panel Backpack](./BlueBear/Deck_Panel_Backpack)|A mounting alternative if you don't want to drill your deck panel | :heavy_check_mark: | :x: | :x: |

printer_mods/claytono/2.4-extrusion-jig/README.md

@@ -0,0 +1,18 @@
+# Voron 2.4 Extrusion Jig
+
+![Voron 2.4 Extrusion Jig](image.png)
+
+## What is this?
+This model is a simple jig to help align the bottom extrusions to each other and the vertical extrusion.  This helps keep everything square when assembling the frame.
+
+## How do I use it?
+
+It's recommended you print four of these, although just printing one is still pretty helpful.  Either way, assemble the frame as described in the manual, but instead of tightening down the screws, leave a little bit of slack so they can still move a little bit.  Once you have done that, clip the jig on to the vertical extrusion and slide it down over the two horizontal extrusions.  Once you've done all four corners, tighten each side, keeping each corner as flat as possible while doing so.
+
+## How should I print this?
+
+Same as any other Voron part.  I printed this in eSUN ABS+, but any ABS will likely work.  I can't speak for PLA or PETG.
+
+### NOTE
+
+How useful this part is will depend a lot on how well calibrated your printer is.  This part should be fairly snug, but not require significant force to put in place or remove.  If you find it's very tight or loose then it will probably not be useful for you.