Merge pull request #3 from prusa3d/MK3

Sync with upstream

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,31 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]<Enter comprehensive title>"
+labels: bug
+assignees: ''
+
+---
+
+Please, before you create a new bug report, please make sure you searched in open and closed issues and couldn't find anything that matches.
+
+**Printer type** - [e.g. MK3S, MK3, MK2.5S, MK2.5, MK2S, MK2]
+**Printer firmware version**-  [e.g. 3.8.1, 3.8.1-RC1, ...]
+
+**MMU Upgrade** - [e.g. MMU2S, MMU2, MMU1]
+**MMU upgrade firmware version [e.g. 1.0.6, 1.0.6-RC2, ...]
+
+**Describe the bug**
+  A clear and concise description of what the bug is.
+
+**To Reproduce**
+  Please describe steps to reproduce the behavior.
+
+**Expected behavior**
+  A clear and concise description of what you expected to happen.
+
+**G-code**
+  Please attach a G-code. This will make it easier for us to replicate the error.
+
+**Video**
+  Please attach a video. It usually helps to solve the problem.

.github/ISSUE_TEMPLATE/enhancement.md

@@ -0,0 +1,20 @@
+---
+name: Enhancement
+about: Suggest an idea for this project
+title: "  [ENHANCEMENT]<Enter comprehensive title>"
+labels: enhancement
+assignees: ''
+
+---
+
+Please, before you create a new feature request, please make sure you searched in open and closed issues and couldn't find anything that matches.
+
+Enter what type of printer or upgrade the enhancement applies to.
+**Printer type** - [e.g. MK3S, MK3, MK2.5S, MK2.5, MK2S, MK2]
+**MMU Upgrade** - [e.g. MMU2S, MMU2, MMU1]
+
+**Is your enhancement related to a problem? Please describe.**
+  A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+  A clear and concise description of what you want to happen.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FEATURE REQUEST]<Enter comprehensive title>"
+labels: feature request
+assignees: ''
+
+---
+
+Please, before you create a new feature request, please make sure you searched in open and closed issues and couldn't find anything that matches.
+
+If it makes sense, enter what type of printer or upgrade the feature request applies to.
+**Printer type** - [e.g. MK3S, MK3, MK2.5S, MK2.5, MK2S, MK2]
+**MMU Upgrade** - [e.g. MMU2S, MMU2, MMU1]
+
+**Is your feature request related to a problem? Please describe.**
+  A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+  A clear and concise description of what you want to happen.

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,12 @@
+---
+name: Question
+about: What do you want to know?
+title: "[QUESTION]<Enter comprehensive title>"
+labels: question
+assignees: ''
+
+---
+
+Please, before you create a new question, please make sure you searched in open and closed issues and couldn't find anything that matches.
+
+**What is your question?**

Firmware/Configuration.h

@@ -16,8 +16,8 @@ extern uint16_t nPrinterType;
 extern PGM_P sPrinterName;
 
 // Firmware version
-#define FW_VERSION "3.8.1"
-#define FW_COMMIT_NR   2869
+#define FW_VERSION "3.9.0"
+#define FW_COMMIT_NR   3175
 // FW_VERSION_UNKNOWN means this is an unofficial build.
 // The firmware should only be checked into github with this symbol.
 #define FW_DEV_VERSION FW_VERSION_UNKNOWN
@@ -345,7 +345,7 @@ your extruder heater takes 2 minutes to hit the target on heating.
   #define Y_PROBE_OFFSET_FROM_EXTRUDER -29
   #define Z_PROBE_OFFSET_FROM_EXTRUDER -12.35
 
-  #define Z_RAISE_BEFORE_HOMING 4       // (in mm) Raise Z before homing (G28) for Probe Clearance.
+  #define Z_RAISE_BEFORE_HOMING 5       // (in mm) Raise Z before homing (G28) for Probe Clearance.
                                         // Be sure you have this distance over your Z_MAX_POS in case
 
   #define XY_TRAVEL_SPEED 8000         // X and Y axis travel speed between probes, in mm/min
@@ -424,7 +424,7 @@ your extruder heater takes 2 minutes to hit the target on heating.
 #define DEFAULT_XJERK                10       // (mm/sec)
 #define DEFAULT_YJERK                10       // (mm/sec)
 #define DEFAULT_ZJERK                 0.4     // (mm/sec)
-#define DEFAULT_EJERK                 2.5     // (mm/sec)
+#define DEFAULT_EJERK                 4.5     // (mm/sec)
 
 //===========================================================================
 //=============================Additional Features===========================
@@ -549,6 +549,12 @@ enum CalibrationStatus
     CALIBRATION_STATUS_UNKNOWN = 0,
 };
 
+// Try to maintain a minimum distance from the bed even when Z is
+// unknown when doing the following operations
+#define MIN_Z_FOR_LOAD    50
+#define MIN_Z_FOR_UNLOAD  20
+#define MIN_Z_FOR_PREHEAT 10
+
 #include "Configuration_adv.h"
 #include "thermistortables.h"
 

Firmware/ConfigurationStore.cpp

@@ -165,8 +165,8 @@ void Config_PrintSettings(uint8_t level)
 #endif
 	if (level >= 10) {
 #ifdef LIN_ADVANCE
-		printf_P(PSTR("%SLinear advance settings:\n   M900 K%.2f   E/D = %.2f\n"),
-			echomagic, extruder_advance_k, advance_ed_ratio);
+		printf_P(PSTR("%SLinear advance settings:%S   M900 K%.2f\n"),
+                 echomagic, echomagic, extruder_advance_K);
 #endif //LIN_ADVANCE
 	}
 }

Firmware/Configuration_adv.h

@@ -268,43 +268,29 @@
 #endif
 
 /**
-    * Implementation of linear pressure control
-    *
-    * Assumption: advance = k * (delta velocity)
-    * K=0 means advance disabled.
-    * See Marlin documentation for calibration instructions.
-    */
+ * Linear Pressure Control v1.5
+ *
+ * Assumption: advance [steps] = k * (delta velocity [steps/s])
+ * K=0 means advance disabled.
+ *
+ * NOTE: K values for LIN_ADVANCE 1.5 differs from earlier versions!
+ *
+ * Set K around 0.22 for 3mm PLA Direct Drive with ~6.5cm between the drive gear and heatbreak.
+ * Larger K values will be needed for flexible filament and greater distances.
+ * If this algorithm produces a higher speed offset than the extruder can handle (compared to E jerk)
+ * print acceleration will be reduced during the affected moves to keep within the limit.
+ *
+ * See http://marlinfw.org/docs/features/lin_advance.html for full instructions.
+ * Mention @Sebastianv650 on GitHub to alert the author of any issues.
+ */
 #define LIN_ADVANCE
 
 #ifdef LIN_ADVANCE
-  #define LIN_ADVANCE_K 0 //Try around 45 for PLA, around 25 for ABS.
-
- /**
-        * Some Slicers produce Gcode with randomly jumping extrusion widths occasionally.
-        * For example within a 0.4mm perimeter it may produce a single segment of 0.05mm width.
-        * While this is harmless for normal printing (the fluid nature of the filament will
-        * close this very, very tiny gap), it throws off the LIN_ADVANCE pressure adaption.
-        *
-        * For this case LIN_ADVANCE_E_D_RATIO can be used to set the extrusion:distance ratio
-        * to a fixed value. Note that using a fixed ratio will lead to wrong nozzle pressures
-        * if the slicer is using variable widths or layer heights within one print!
-        *
-        * This option sets the default E:D ratio at startup. Use `M900` to override this value.
-        *
-        * Example: `M900 W0.4 H0.2 D1.75`, where:
-        *   - W is the extrusion width in mm
-        *   - H is the layer height in mm
-        *   - D is the filament diameter in mm
-        *
-        * Example: `M900 R0.0458` to set the ratio directly.
-        *
-        * Set to 0 to auto-detect the ratio based on given Gcode G1 print moves.
-        *
-        * Slic3r (including Prusa Slic3r) produces Gcode compatible with the automatic mode.
-        * Cura (as of this writing) may produce Gcode incompatible with the automatic mode.
-        */
-#define LIN_ADVANCE_E_D_RATIO 0 // The calculated ratio (or 0) according to the formula W * H / ((D / 2) ^ 2 * PI)
-                                // Example: 0.4 * 0.2 / ((1.75 / 2) ^ 2 * PI) = 0.033260135
+  #define LIN_ADVANCE_K 0  // Unit: mm compression per 1mm/s extruder speed
+  //#define LA_NOCOMPAT    // Disable Linear Advance 1.0 compatibility
+  //#define LA_LIVE_K      // Allow adjusting K in the Tune menu
+  //#define LA_DEBUG       // If enabled, this will generate debug information output over USB.
+  //#define LA_DEBUG_LOGIC // @wavexx: setup logic channels for isr debugging
 #endif
 
 // Arc interpretation settings: