## Add: Board for Vellemann K8200 (derived from 3Drag)
* Boards.h: updated comment for board 3Drag - K8200 removed
* Boards.h: added `BOARD_K8200` with ID 78
* language.h.: machine name and firmware URL for new board
* pins.h: added `K8200` to any `#if` with `3Drag` and corresponding
comments
When a melzi board and a full gfx are both selected, the build fails
blaming for some missing defines.
This is a fix for the issue: now my configuration works.
* K8200: new folder in example_configurations for Vellemann K8200 (3Drag
clone - should work with 3Drag too, please report)
* K8200/language.h: updated machine name and URL for K8200
* K8200/Configuration.h/Configuration_adv.h: updated manually with
parameters
form genuine Vellemann Firmware "firmware_k8200_marlinv2" based on the
recent development branch
* K8200/files by Vellemann: added folder with original files from
Vellemann homepage, since there is no GitHub fork you could link to by
them
I tested the changes on my K8200 with 20x4-LCD and Arduino 1.0.5 for
Windows - everything works well
* Adds config parameter `PID_PARAMS_PER_EXTRUDER` - allows single PID
parameters to be used where this would be preferable (e.g. dual
identical extruders)
* When disabled, will use `float Kp, Ki, Kd, Kc;` as before.
Preprocessor macros used to switch between.
* ultralcd.cpp defines extra menus for extra parameters only where
required
* M301 reports `e:xx` only if independent pid parameters enabled
* EEPROM structure still leaves space for 3 extruders worth, when undef
will save single parameter to all extruder positions, but only read the
first
* Switching off saves approx 330 B with no LCD enabled, 2634B with LCD
(RRD) enabled: this is significant.
* LCD modifications should be tested.
This change introduces an improvement to G29 command on Marlin.
Auto bed leveling operation's reliability is based on the repeatability of the Z-probe switch and the servo. This change introduces an option to G29 command. When the G29 command is sent with an "e" option, during auto bed levelling the servo is not retracted between probes which decreases the bias on auto bed levelling resulting from servo.
G29 command does the auto bed probing as it is.
G29 E command engages the servo on first probing point, probes all points and retracts the servo after probing the last point.
Please comment your opinions, test on your printer and check the code on a programmer's perspective. (I am not a good programmer.)
* Depending on extruder count, will add menu items for ultralcd to edit
individual PID parameters for each extruder
* Added menu items to each language_xx.h
* Builds OK, but recommend testing with typical LCD
