Voron0_Block_and_Tackle_Z_Belt (#509)

* Create README.md

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* Improved hinge clearance

0.2mm increased to 0.3mm clearance should hopefully prevent fusing of walls.

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Z travel fix

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printer_mods/MCMBen/Voron0_Block_and_Tackle_Z_Belt/README.md

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+# Overview
+A block & tackle Z belt implementation for the Voron 0 / Voron 0.1.
+
+The goal was to make use of the original V0 Z motor and timing belt in a compact format, using hardware and screws already in the V0.1 BoM where possible. No additional M3 nuts need to be preloaded - so no disassembly of the frame - though two will need to be inserted into one of the Z axis extrusions.
+
+By default this mod uses 40T & 16T pulleys, combining with the 2:1 of the block and tackle, to give a 5:1 ratio.
+
+Larger pulleys - up to 64 teeth - can be used to increase this ratio, but will require longer timing belts.
+
+The V0 skirt/feet are too short, so this mod requires a taller skirt, such as [hartk1213's extrusion skirt mod](https://github.com/VoronDesign/VoronUsers/tree/master/printer_mods/hartk1213/Voron0_ExtrusionSkirt), [doubletrouble023's skirt mod](https://github.com/VoronDesign/VoronUsers/tree/master/printer_mods/doubletrouble/V0_Skirt_Mod), or [my own Trident-style skirt mod (WiP)](https://github.com/Fleafa/VoronUsers/tree/V0.1-Trident-skirt/printer_mods/MCMBen/Voron0_Block_and_Tackle_Z_Belt).
+The V0.1 skirt/feet have enough height, though a 64T pulley may be a squeeze.
+
+*Testing has shown there is a maximum of 115mm in Z with the original design. The current files have been modified to address this, but the travel distance has not been tested.*
+
+Both the V0 and V0.1 bed positions are now supported - just print the appropriate bed_front_\*.stl file.
+
+![image](./Images/Block_and_Tackle_Z_Belt_Render.png)
+![image](./Images/Block_and_Tackle_Z_Belt_Drawing.png)
+
+# BoM
+This BoM doesn't include the 2x self-tapping screws, M3x12 BHCS, and Omron switch for the Z stop, though for clarity it does include some hardware which is reused from the V0 and V0.1 builds.
+## Common
+Component | Quantity
+--- | :-:
+M3x8 BHCS | 2
+M3x10 BHCS | 5
+M3x12 BHCS | 3
+M3x16 BHCS | 6
+M3x25 BHCS | 3
+M3x30 BHCS | 2
+M3 threaded insert | 6
+3x12 pin | 1
+F623 bearing | 6
+F695 2RS bearing | 1
+MF105 bearing | 1
+GT2 16T pulley | 3
+NEMA14 motor | 1
+3x6x0.5 shim | 6
+5x10x0.5 shim (optional) | 2-4
+5x50 shaft | 1
+GATES GT2 open belt | ~700mm
+
+## Timing Belt
+Ratio | Type | Length
+--- | :-: | ---
+5:1 | GATES GT2 | 110mm
+6:1 | GATES GT2 | 122mm
+8:1 | GATES GT2 | 152mm
+  | **OR** |  
+8:1 | GT2 | 146mm
+
+#Klipper Config
+This assumes SKR Mini E3 v2 and stock V0 Z motor.
+```
+[stepper_z]
+step_pin: PB0
+dir_pin: !PC5           # Remove ! if moving opposite direction
+enable_pin: !PB1
+rotation_distance: 32
+gear_ratio: 40:16, 2:1
+full_steps_per_rotation: 200
+microsteps: 16
+endstop_pin: PC2
+position_endstop: -0.10
+position_max: 120       # Check that there is enough travel - you may need to reduce this by a couple of mm
+position_min: -1.5
+homing_speed: 20        # Default 20, Max 100
+second_homing_speed: 3.0
+homing_retract_dist: 3.0
+
+[tmc2209 stepper_z]
+uart_pin: PC11
+tx_pin: PC10
+uart_address: 1
+interpolate: True
+run_current: 0.37       # For V0 spec NEMA17 LDO-35STH42-0504AH
+hold_current: 0.35
+sense_resistor: 0.110
+stealthchop_threshold: 500
+
+[printer]
+max_z_velocity: 30      # Default 15, test before increasing
+max_z_accel: 350        # Default 45, test before increasing
+```

printer_mods/README.md

@@ -213,6 +213,7 @@ like so:
 | | [V0 LED Hinge](./Maverick_/V0_LED_Hinge) | A modification designed to accomodate a Neopixel Jewel (7) in the top right hinge of the door. | :heavy_check_mark: | :x: | :x: |:x:|
 | | [V0 TopHat Mini 12864](./Maverick_/V0_TopHat_Mini_12864) | Modified TopHat to mount a Mini 12864. | :heavy_check_mark: | :x: | :x: |:x:|
 | MCKURT |[Switchwire Y Belt Tensioner](./Mckurt/Switchwire_Y_Belt_Tensioner) | Switchwie Y axis Belt Tensioner | :x: | :x: | :x: | :heavy_check_mark: | :x: |
+| MCMBen | [Voron0 Block & Tackle Z Belt](./MCMBen/Voron0_Block_and_Tackle_Z_Belt) | A block & tackle belted Z solution using NEMA14. Ratios from 5:1 to 8:1 and friction prevent Z drop when powered off. | :heavy_check_mark: | :x: | :x: | :x: | :x: |
 |MikesMods|[LGX mount for V0.1 with 2nd X rail](./MikesMods/LGX_mount_for_V0.1_with_2nd_X_rail) |V0.1 mod for mounting Bondtech LGX extruder with addition of 2nd X rail on the back of the 1515 extrusion. | :heavy_check_mark: | :x: | :x: |:x:|:x:|
 |mjoaris |[10x11 Cable Chain Endcaps](./mjoaris/10x11_Cable_Chain_Endcaps) |Printable Endcaps for 10x11 Cable Chains |:x: |:heavy_check_mark: |:heavy_check_mark: |:x:|
 | |[Mini12864 LCD Mount](./mjoaris/Mini12864_LCD_Mount_for_V2.4) |Swiveling case for the Fysetc Mini12864 LCD |:x: |:grey_question: |:heavy_check_mark: |:x:|