afterburner dial test indicator mount by arkeet (#108)

printer_mods/README.md

@@ -25,6 +25,7 @@ like so:
 
 | Creator | Mod title | Description | V0 | V1.8 | V2.4 |
 | --- | --- | --- | --- | --- | --- |
+|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:|
 |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:|
 |Dan88 |[V0 one-part Skirts](./Dan88/V0skirt) |One part Skirts for the V0 |:heavy_check_mark: |:x: |:x: |

printer_mods/arkeet/dti-mount/README.md

@@ -0,0 +1,26 @@
+Dial test indicator mount for Afterburner
+=========================================
+
+This replaces the Afterburner toolhead with a dovetail mount for a dial test
+indicator (such as a Mitutoyo 513-404, which this was modelled on). The
+indicator point is ideally located at the same position as the nozzle (the
+precise Y position may vary depending on the length of the tip). There is a
+protrusion where the nozzle would be located, so that Z homing can be done
+normally as though a nozzle were present.
+
+This can be used, for instance, to verify whether a mesh reflects the true
+form of the bed surface: sweeping the bed with the mesh enabled would ideally
+show no movement on the indicator.
+
+Required hardware
+-----------------
+
+- M3x8 SHCS (4x)
+- M3 hex nut (2x)
+
+Images
+------
+
+![photo](images/photo.jpg)
+
+![render](images/render.png)