Merge branch 'Z-Top-Idlers' of https://github.com/Itzo1978/VoronUsers into Z-Top-Idlers

Author: Itzo1978

printer_mods/Itzo1978/Z-Top Idlers/README.md

@@ -1,3 +1,39 @@
 # Z-Top Idlers 9mm
 
-<img src="Images/Z-Top Idlers.png">
+## Description
+Z-axis tensioner tightened from above, with the screw aligned with the toothed wheel
+
+<table>
+	<tr>
+		<td><b>Original</b></td>
+		<td><b>My mod</b></td>
+	</tr>
+	<tr>
+		<td><img src="Images/Z Idlers (original).png"></td>
+		<td><img src="Images/Z-Top Idlers.png"></td>
+	</tr>
+	<tr>
+		<td><img src="Images/Z Idlers (coupe).png"></td>
+		<td><img src="Images/Z-Top Idlers (coupe).png"></td>
+	</tr>
+</table>
+
+
+## Why this mod
+
+I noticed a deformation of the belts. It's moving forwards causing the belt to be a few millimetres out of alignment.
+* Consequence: the Z height cannot be respected without a correction in klipper (with `distance_rotation`).
+
+My model makes it possible to correct this phenomenon.
+
+Tightening the screw from above to tension the belt is much easier than from below.
+
+
+## BOM
+* [a]_z-top_tensioner_9mm_x4
+* z-top_tensioner_bracket_a_x2
+* z-top_tensioner_bracket_b_x2
+* 4x Hex nuts M3 DIN 934
+* 4x M3 x 20 SHCS
+* 8x M5 x 20 BHCS
+* 4x GT2 20 Tooth Idler 9mm wide