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🚸 Fix and improve Prusa MK3 configs (#607)

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# Einsy Rambo Config for Průša MK3S
## Requirements
- [Průša MK3S, MK3S+, or MK3 with MK3S/MK3S+ upgrade](https://www.prusa3d.com/original-prusa-i3-mk3/) is required for filament runout to work properly.
- Stock Einsy Rambo with integrated TMC2130s
## Configuration Options
Flags specific to this printer/configuration:
- `MK3_FAN_PINS` - Disable this for `FAN_PIN 8` and `FAN1_PIN 6`
- `GEARBOX_BEAR` - Is printer equipped with a 3.5:1 gearbox on the extruder?
- `LOWBAUD` - Printer needs lower baudrate?
- `TALLBEAR` - Tall Bear (320mm)?
- `SUPERPINDA` - SuperPinda present?
## Changes to Start G-code
The `W` in Průša's `G28 W ; home all without mesh bed level` default G-code does not exist in Marlin and [`G80 ; mesh bed leveling`](https://marlinfw.org/docs/gcode/G080.html) cancels the current motion mode, so no bed leveling will take place.
Below are some example start G-code scripts from popular slicers to get you started.
### PrusaSlicer
Paste the start G-code block below in the "Custom G-code" section under "Printer Settings". Use the "Custom G-code" section under "Filament Settings" to add the [Linear Advance](https://marlinfw.org/docs/features/lin_advance.html) (`M900 K0.0`) value since it can be saved on a per-filament basis.
```gcode
G90 ; use absolute coordinates
M83 ; extruder relative mode
M104 S170 ; preheat hotend to 170
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
G28 ; home all
G29 ; mesh bed leveling
G1 X0 Z0.6 Y-3.0 F1000.0 ; go outside print area
M104 S[first_layer_temperature] ; set hotend temp
M109 S[first_layer_temperature] ; wait for hotend temp
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
```
### Cura
Paste the start G-code block below in the "Start G-code" section. Add your [Linear Advance](https://marlinfw.org/docs/features/lin_advance.html) (`M900 K0.0`) value in the start G-code block below:
```gcode
G90 ; use absolute coordinates
M83 ; extruder relative mode
M900 K0.0 ; place your linear advance value here
M104 S170 ; preheat hotend to 170
M140 S{material_bed_temperature_layer_0} ; set bed temp
M190 S{material_bed_temperature_layer_0} ; wait for bed temp
G28 ; home all
G29 ; mesh bed leveling
G1 X0 Z0.6 Y-3.0 F1000.0 ; go outside print area
M104 S{material_print_temperature_layer_0} ; set hotend temp
M109 S{material_print_temperature_layer_0} ; wait for hotend temp
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
```
### IdeaMaker
Paste the start G-code block below in the filament's "Start G-code" section. Add your [Linear Advance](https://marlinfw.org/docs/features/lin_advance.html) (`M900 K0.0`) value in the start G-code block below:
```gcode
G90 ; use absolute coordinates
M83 ; extruder relative mode
M900 K0.0 ; place your linear advance value here
M104 S170 ; preheat hotend to 170
M140 S{temperature_heatbed} ; set bed temp
M190 S{temperature_heatbed} ; wait for bed temp
G28 ; home all
G29 ; mesh bed leveling
G1 X0 Z0.6 Y-3.0 F1000.0 ; go outside print area
M104 S{temperature_extruder1} ; set hotend temp
M109 S{temperature_extruder1} ; wait for hotend temp
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
```
### Simplify3D
Paste the start G-code block below in the "Starting Script" section. Add your [Linear Advance](https://marlinfw.org/docs/features/lin_advance.html) (`M900 K0.0`) value in the start G-code block below:
```gcode
G90 ; use absolute coordinates
M83 ; extruder relative mode
M900 K0.0 ; place your linear advance value here
M104 S170 ; preheat hotend to 170
M140 S[bed0_temperature] ; set bed temp
M190 S[bed0_temperature] ; wait for bed temp
G28 ; home all
G29 ; mesh bed leveling
G1 X0 Z0.6 Y-3.0 F1000.0 ; go outside print area
M104 S[extruder0_temperature] T0 ; set hotend temp
M109 S[extruder0_temperature] T0 ; wait for hotend temp
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
```