|
|
@@ -1,112 +0,0 @@
|
|
1
|
|
-# Features
|
|
2
|
|
-
|
|
3
|
|
-* Interrupt based movement with real linear acceleration
|
|
4
|
|
-* High steprate
|
|
5
|
|
-* Look ahead (Keep the speed high when possible. High cornering speed)
|
|
6
|
|
-* Interrupt based temperature protection
|
|
7
|
|
-* Preliminary support for [Matthew Roberts Advance Algorithm](http://reprap.org/pipermail/reprap-dev/2011-May/003323.html)
|
|
8
|
|
-* Full endstop support
|
|
9
|
|
-* SD Card support
|
|
10
|
|
-* SD Card folders (works in pronterface)
|
|
11
|
|
-* SD Card autostart support
|
|
12
|
|
-* LCD support (ideally 20x4)
|
|
13
|
|
-* LCD menu system for autonomous SD card printing, controlled by an click-encoder.
|
|
14
|
|
-* EEPROM storage of e.g. max-velocity, max-acceleration, and similar variables
|
|
15
|
|
-* many small but handy things originating from bkubicek's fork.
|
|
16
|
|
-* Arc support
|
|
17
|
|
-* Temperature oversampling
|
|
18
|
|
-* Dynamic Temperature setpointing aka "AutoTemp"
|
|
19
|
|
-* Support for [QTMarlin](https://github.com/bkubicek/QTMarlin), a very beta GUI for PID-tuning and velocity-acceleration testing.
|
|
20
|
|
-* Endstop trigger reporting to the host software.
|
|
21
|
|
-* Updated sdcardlib
|
|
22
|
|
-* Heater power reporting. Useful for PID monitoring.
|
|
23
|
|
-* PID tuning
|
|
24
|
|
-* [CoreXY kinematics](www.corexy.com/theory.html)
|
|
25
|
|
-* Delta kinematics
|
|
26
|
|
-* SCARA kinematics
|
|
27
|
|
-* Dual X-carriage support for multiple extruder systems
|
|
28
|
|
-* Configurable serial port to support connection of wireless adaptors.
|
|
29
|
|
-* Automatic operation of extruder/cold-end cooling fans based on nozzle temperature
|
|
30
|
|
-* RC Servo Support, specify angle or duration for continuous rotation servos.
|
|
31
|
|
-* Bed Auto Leveling.
|
|
32
|
|
-* Support for a filament diameter sensor, which adjusts extrusion volume
|
|
33
|
|
-
|
|
34
|
|
-The default baudrate is 250000. This baudrate has less jitter and hence errors than the usual 115200 baud, but is less supported by drivers and host-environments.
|
|
35
|
|
-
|
|
36
|
|
-## Differences and additions to the already good Sprinter firmware
|
|
37
|
|
-
|
|
38
|
|
-### Look-ahead
|
|
39
|
|
-
|
|
40
|
|
-Marlin has look-ahead. While sprinter has to break and re-accelerate at each corner,
|
|
41
|
|
-lookahead will only decelerate and accelerate to a velocity,
|
|
42
|
|
-so that the change in vectorial velocity magnitude is less than the xy_jerk_velocity.
|
|
43
|
|
-This is only possible, if some future moves are already processed, hence the name.
|
|
44
|
|
-It leads to less over-deposition at corners, especially at flat angles.
|
|
45
|
|
-
|
|
46
|
|
-### Arc support
|
|
47
|
|
-
|
|
48
|
|
-Slic3r can find curves that, although broken into segments, were ment to describe an arc.
|
|
49
|
|
-Marlin is able to print those arcs. The advantage is the firmware can choose the resolution,
|
|
50
|
|
-and can perform the arc with nearly constant velocity, resulting in a nice finish.
|
|
51
|
|
-Also, less serial communication is needed.
|
|
52
|
|
-
|
|
53
|
|
-### Temperature Oversampling
|
|
54
|
|
-
|
|
55
|
|
-To reduce noise and make the PID-differential term more useful, 16 ADC conversion results are averaged.
|
|
56
|
|
-
|
|
57
|
|
-### AutoTemp
|
|
58
|
|
-
|
|
59
|
|
-If your gcode contains a wide spread of extruder velocities, or you realtime change the building speed, the temperature should be changed accordingly.
|
|
60
|
|
-Usually, higher speed requires higher temperature.
|
|
61
|
|
-This can now be performed by the AutoTemp function
|
|
62
|
|
-By calling M109 S<mintemp> B<maxtemp> F<factor> you enter the autotemp mode.
|
|
63
|
|
-
|
|
64
|
|
-You can leave it by calling M109 without any F.
|
|
65
|
|
-If active, the maximal extruder stepper rate of all buffered moves will be calculated, and named "maxerate" [steps/sec].
|
|
66
|
|
-The wanted temperature then will be set to t=tempmin+factor*maxerate, while being limited between tempmin and tempmax.
|
|
67
|
|
-If the target temperature is set manually or by gcode to a value less then tempmin, it will be kept without change.
|
|
68
|
|
-Ideally, your gcode can be completely free of temperature controls, apart from a M109 S T F in the start.gcode, and a M109 S0 in the end.gcode.
|
|
69
|
|
-
|
|
70
|
|
-### EEPROM
|
|
71
|
|
-
|
|
72
|
|
-If you know your PID values, the acceleration and max-velocities of your unique machine, you can set them, and finally store them in the EEPROM.
|
|
73
|
|
-After each reboot, it will magically load them from EEPROM, independent what your Configuration.h says.
|
|
74
|
|
-
|
|
75
|
|
-### LCD Menu
|
|
76
|
|
-
|
|
77
|
|
-If your hardware supports it, you can build yourself a LCD-CardReader+Click+encoder combination. It will enable you to realtime tune temperatures,
|
|
78
|
|
-accelerations, velocities, flow rates, select and print files from the SD card, preheat, disable the steppers, and do other fancy stuff.
|
|
79
|
|
-One working hardware is documented here: http://www.thingiverse.com/thing:12663
|
|
80
|
|
-Also, with just a 20x4 or 16x2 display, useful data is shown.
|
|
81
|
|
-
|
|
82
|
|
-### SD card directories
|
|
83
|
|
-
|
|
84
|
|
-If you have an SD card reader attached to your controller, also folders work now. Listing the files in pronterface will show "/path/subpath/file.g".
|
|
85
|
|
-You can write to file in a subfolder by specifying a similar text using small letters in the path.
|
|
86
|
|
-Also, backup copies of various operating systems are hidden, as well as files not ending with ".g".
|
|
87
|
|
-
|
|
88
|
|
-### Autostart
|
|
89
|
|
-
|
|
90
|
|
-If you place a file auto[0-9].g into the root of the sd card, it will be automatically executed if you boot the printer. The same file will be executed by selecting "Autostart" from the menu.
|
|
91
|
|
-First *0 will be performed, than *1 and so on. That way, you can heat up or even print automatically without user interaction.
|
|
92
|
|
-
|
|
93
|
|
-### Endstop trigger reporting
|
|
94
|
|
-
|
|
95
|
|
-If an endstop is hit while moving towards the endstop, the location at which the firmware thinks that the endstop was triggered is outputed on the serial port.
|
|
96
|
|
-This is useful, because the user gets a warning message.
|
|
97
|
|
-However, also tools like QTMarlin can use this for finding acceptable combinations of velocity+acceleration.
|
|
98
|
|
-
|
|
99
|
|
-### Coding paradigm
|
|
100
|
|
-
|
|
101
|
|
-Not relevant from a user side, but Marlin was split into thematic junks, and has tried to partially enforced private variables.
|
|
102
|
|
-This is intended to make it clearer, what interacts which what, and leads to a higher level of modularization.
|
|
103
|
|
-We think that this is a useful prestep for porting this firmware to e.g. an ARM platform in the future.
|
|
104
|
|
-A lot of RAM (with enabled LCD ~2200 bytes) was saved by storing char []="some message" in Program memory.
|
|
105
|
|
-In the serial communication, a #define based level of abstraction was enforced, so that it is clear that
|
|
106
|
|
-some transfer is information (usually beginning with "echo:"), an error "error:", or just normal protocol,
|
|
107
|
|
-necessary for backwards compatibility.
|
|
108
|
|
-
|
|
109
|
|
-### Interrupt based temperature measurements
|
|
110
|
|
-
|
|
111
|
|
-An interrupt is used to manage ADC conversions, and enforce checking for critical temperatures.
|
|
112
|
|
-This leads to less blocking in the heater management routine.
|
Bo Herrmannsen
10 years ago