Enable heatbed PID mode and add several tweaks

Enable PIDTEMPBED and add several tweaks

• Enabling heatbed PID tuning
• Tweaking default hotend PID
• Enhancing MMBL grid from 9 points to 25 (3x3 to 5x5 -
 fair warning, leveling might take a few minutes now!)
• Increasing buffer and lowering baudrate to ensure smoother prints via USB
• Removing some redundant stuff to save memory

Thanks to @NetrunnerAT for his recommendations!

Co-Authored-By: NetrunnerAT <netrunnerat@users.noreply.github.com>

Marlin/Configuration.h

@@ -123,7 +123,7 @@
  *
  * :[2400, 9600, 19200, 38400, 57600, 115200, 250000, 500000, 1000000]
  */
-#define BAUDRATE 250000
+#define BAUDRATE 115200
 
 // Enable the Bluetooth serial interface on AT90USB devices
 //#define BLUETOOTH
@@ -238,7 +238,7 @@
  *
  * :{ 0:'No power switch', 1:'ATX', 2:'X-Box 360' }
  */
-#define POWER_SUPPLY 1
+//#define POWER_SUPPLY 1
 
 #if POWER_SUPPLY > 0
   // Enable this option to leave the PSU off at startup.
@@ -380,9 +380,9 @@
   // If you are using a pre-configured hotend then you can use one of the value sets by uncommenting it
 
   // i3 Mega
-  #define  DEFAULT_Kp 22.2
-  #define  DEFAULT_Ki 3.5
-  #define  DEFAULT_Kd 154
+  #define  DEFAULT_Kp 17.5
+  #define  DEFAULT_Ki 1.06
+  #define  DEFAULT_Kd 72.39
 
   // Ultimaker
   //#define  DEFAULT_Kp 22.2
@@ -418,7 +418,7 @@
  * heater. If your configuration is significantly different than this and you don't understand
  * the issues involved, don't use bed PID until someone else verifies that your hardware works.
  */
-//#define PIDTEMPBED
+#define PIDTEMPBED
 
 //#define BED_LIMIT_SWITCHING
 
@@ -434,11 +434,10 @@
 
   //#define PID_BED_DEBUG // Sends debug data to the serial port.
 
-  //120V 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
-  //from FOPDT model - kp=.39 Tp=405 Tdead=66, Tc set to 79.2, aggressive factor of .15 (vs .1, 1, 10)
-  #define DEFAULT_bedKp 10.00
-  #define DEFAULT_bedKi .023
-  #define DEFAULT_bedKd 305.4
+  //Anycubic i3 Mega 160W Ultrabase
+  #define DEFAULT_bedKp 198.55
+  #define DEFAULT_bedKi 39.09
+  #define DEFAULT_bedKd 252.11
 
   //120V 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
   //from pidautotune
@@ -1083,7 +1082,7 @@
   //===========================================================================
 
   #define MESH_INSET 10          // Set Mesh bounds as an inset region of the bed
-  #define GRID_MAX_POINTS_X 3    // Don't use more than 7 points per axis, implementation limited.
+  #define GRID_MAX_POINTS_X 5    // Don't use more than 7 points per axis, implementation limited.
   #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X
 
   //#define MESH_G28_REST_ORIGIN // After homing all axes ('G28' or 'G28 XYZ') rest Z at Z_MIN_POS
@@ -1401,7 +1400,7 @@
  *
  * :{ 'en':'English', 'an':'Aragonese', 'bg':'Bulgarian', 'ca':'Catalan', 'cn':'Chinese', 'cz':'Czech', 'cz_utf8':'Czech (UTF8)', 'de':'German', 'el':'Greek', 'el-gr':'Greek (Greece)', 'es':'Spanish', 'es_utf8':'Spanish (UTF8)', 'eu':'Basque-Euskera', 'fi':'Finnish', 'fr':'French', 'fr_utf8':'French (UTF8)', 'gl':'Galician', 'hr':'Croatian', 'it':'Italian', 'kana':'Japanese', 'kana_utf8':'Japanese (UTF8)', 'nl':'Dutch', 'pl':'Polish', 'pt':'Portuguese', 'pt-br':'Portuguese (Brazilian)', 'pt-br_utf8':'Portuguese (Brazilian UTF8)', 'pt_utf8':'Portuguese (UTF8)', 'ru':'Russian', 'sk_utf8':'Slovak (UTF8)', 'tr':'Turkish', 'uk':'Ukrainian', 'zh_CN':'Chinese (Simplified)', 'zh_TW':'Chinese (Taiwan)', 'test':'TEST' }
  */
-#define LCD_LANGUAGE en
+//#define LCD_LANGUAGE en
 
 /**
  * LCD Character Set
@@ -1425,7 +1424,7 @@
  *
  * :['JAPANESE', 'WESTERN', 'CYRILLIC']
  */
-#define DISPLAY_CHARSET_HD44780 JAPANESE
+//#define DISPLAY_CHARSET_HD44780 JAPANESE
 
 /**
  * SD CARD
@@ -1935,6 +1934,6 @@
 // Enable Anycubic TFT
 #define ANYCUBIC_TFT_MODEL
 #define ANYCUBIC_FILAMENT_RUNOUT_SENSOR
-#define ANYCUBIC_TFT_DEBUG
+//#define ANYCUBIC_TFT_DEBUG
 
 #endif // CONFIGURATION_H