Ender 3 Switchwire Conversion Y Tensioner Mod (#339)

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* Delete assembled.jpg

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Fixed the printability issue with the hexnut file

printer_mods/README.md

@@ -58,6 +58,7 @@ like so:
 | btp | [Galileo chain mount (befenybay)](./btp/Galileo_Switchwire_Chain_Mount/README.md) | Modified chain mount position to cater for difference with Galileo Clockwork |:x:|:x:|:x:|:heavy_check_mark:|
 | buzzdalf | [v1.8/2.4 Afterburner connector cover for 42STH20-1004AS](./buzzdalf/connector_cover) | v1.8/2.4 Connector cover for 42STH20-1004AS | :x: | :heavy_check_mark: | :heavy_check_mark: |:grey_question:|
 ||[Ender 3 Switchwire Taller Z Mod](./buzzdalf/ender_switchwire_taller_z) | Taller Z Mod | :x: | :x: | :x: | :heavy_check_mark: |
+||[Ender 3 Switchwire Y Tensioner Mod](./buzzdalf/ytension) | Y Tension Mod | :x: | :x: | :x: | :heavy_check_mark: |
  ByteChild | [ESP32 DIN Rail Bracket](./ByteChild/ESP32_DIN_Rail_Bracket) | DIN rail mounting bracket for an ESP32 | :x: | :grey_question: | :heavy_check_mark: | :x: |
  || [2-Channel Relay DIN Rail Bracket](./ByteChild/2_Channel_Relay_DIN_Rail_Bracket) | DIN Rail mounting bracket for an 2-Channel-Relay | :x: | :grey_question: | :heavy_check_mark: | :x: |
 | Ch4rlesB | [V0 Handles Slim](./Ch4rlesB/V0_Handles_Slim) | Simple and slim handles for the V0 | :heavy_check_mark: | :x: | :x: | :x: |

printer_mods/buzzdalf/ytension/README.md

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+This mod adds a y-tensioner to the Gizzle Ender 3 conversion.
+
+You will need a base conversion for your Ender 3 in addition to these files.  You can find [Gizzle's Ender 3 conversion](../../Gizzle/ender-3_(pro)_switchwire) in the VoronUsers github page.
+
+HARDWARE: 
+  m5x30 BHCS,
+  m5x16 BHCS,
+  m5x10 BHCS,
+  m5x12 SHCS,
+  m5 Nut (x2 optional),
+  m5 Heatset (optional)
+
+![image1](IMAGES/installed.jpg)
+
+![image2](IMAGES/parts.jpg)
+
+![image3](IMAGES/stack.jpg)
+
+![image4](IMAGES/assembled.jpg)