mirror of
https://github.com/MarlinFirmware/Marlin.git
synced 2024-12-18 00:07:50 +00:00
113 lines
6.1 KiB
Markdown
113 lines
6.1 KiB
Markdown
# Features
|
|
|
|
* Interrupt based movement with real linear acceleration
|
|
* High steprate
|
|
* Look ahead (Keep the speed high when possible. High cornering speed)
|
|
* Interrupt based temperature protection
|
|
* Preliminary support for [Matthew Roberts Advance Algorithm](http://reprap.org/pipermail/reprap-dev/2011-May/003323.html)
|
|
* Full endstop support
|
|
* SD Card support
|
|
* SD Card folders (works in pronterface)
|
|
* SD Card autostart support
|
|
* LCD support (ideally 20x4)
|
|
* LCD menu system for autonomous SD card printing, controlled by an click-encoder.
|
|
* EEPROM storage of e.g. max-velocity, max-acceleration, and similar variables
|
|
* many small but handy things originating from bkubicek's fork.
|
|
* Arc support
|
|
* Temperature oversampling
|
|
* Dynamic Temperature setpointing aka "AutoTemp"
|
|
* Support for [QTMarlin](https://github.com/bkubicek/QTMarlin), a very beta GUI for PID-tuning and velocity-acceleration testing.
|
|
* Endstop trigger reporting to the host software.
|
|
* Updated sdcardlib
|
|
* Heater power reporting. Useful for PID monitoring.
|
|
* PID tuning
|
|
* [CoreXY kinematics](www.corexy.com/theory.html)
|
|
* Delta kinematics
|
|
* SCARA kinematics
|
|
* Dual X-carriage support for multiple extruder systems
|
|
* Configurable serial port to support connection of wireless adaptors.
|
|
* Automatic operation of extruder/cold-end cooling fans based on nozzle temperature
|
|
* RC Servo Support, specify angle or duration for continuous rotation servos.
|
|
* Bed Auto Leveling.
|
|
* Support for a filament diameter sensor, which adjusts extrusion volume
|
|
|
|
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.
|
|
|
|
## Differences and additions to the already good Sprinter firmware
|
|
|
|
### Look-ahead
|
|
|
|
Marlin has look-ahead. While sprinter has to break and re-accelerate at each corner,
|
|
lookahead will only decelerate and accelerate to a velocity,
|
|
so that the change in vectorial velocity magnitude is less than the xy_jerk_velocity.
|
|
This is only possible, if some future moves are already processed, hence the name.
|
|
It leads to less over-deposition at corners, especially at flat angles.
|
|
|
|
### Arc support
|
|
|
|
Slic3r can find curves that, although broken into segments, were ment to describe an arc.
|
|
Marlin is able to print those arcs. The advantage is the firmware can choose the resolution,
|
|
and can perform the arc with nearly constant velocity, resulting in a nice finish.
|
|
Also, less serial communication is needed.
|
|
|
|
### Temperature Oversampling
|
|
|
|
To reduce noise and make the PID-differential term more useful, 16 ADC conversion results are averaged.
|
|
|
|
### AutoTemp
|
|
|
|
If your gcode contains a wide spread of extruder velocities, or you realtime change the building speed, the temperature should be changed accordingly.
|
|
Usually, higher speed requires higher temperature.
|
|
This can now be performed by the AutoTemp function
|
|
By calling M109 S<mintemp> B<maxtemp> F<factor> you enter the autotemp mode.
|
|
|
|
You can leave it by calling M109 without any F.
|
|
If active, the maximal extruder stepper rate of all buffered moves will be calculated, and named "maxerate" [steps/sec].
|
|
The wanted temperature then will be set to t=tempmin+factor*maxerate, while being limited between tempmin and tempmax.
|
|
If the target temperature is set manually or by gcode to a value less then tempmin, it will be kept without change.
|
|
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.
|
|
|
|
### EEPROM
|
|
|
|
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.
|
|
After each reboot, it will magically load them from EEPROM, independent what your Configuration.h says.
|
|
|
|
### LCD Menu
|
|
|
|
If your hardware supports it, you can build yourself a LCD-CardReader+Click+encoder combination. It will enable you to realtime tune temperatures,
|
|
accelerations, velocities, flow rates, select and print files from the SD card, preheat, disable the steppers, and do other fancy stuff.
|
|
One working hardware is documented here: http://www.thingiverse.com/thing:12663
|
|
Also, with just a 20x4 or 16x2 display, useful data is shown.
|
|
|
|
### SD card directories
|
|
|
|
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".
|
|
You can write to file in a subfolder by specifying a similar text using small letters in the path.
|
|
Also, backup copies of various operating systems are hidden, as well as files not ending with ".g".
|
|
|
|
### Autostart
|
|
|
|
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.
|
|
First *0 will be performed, than *1 and so on. That way, you can heat up or even print automatically without user interaction.
|
|
|
|
### Endstop trigger reporting
|
|
|
|
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.
|
|
This is useful, because the user gets a warning message.
|
|
However, also tools like QTMarlin can use this for finding acceptable combinations of velocity+acceleration.
|
|
|
|
### Coding paradigm
|
|
|
|
Not relevant from a user side, but Marlin was split into thematic junks, and has tried to partially enforced private variables.
|
|
This is intended to make it clearer, what interacts which what, and leads to a higher level of modularization.
|
|
We think that this is a useful prestep for porting this firmware to e.g. an ARM platform in the future.
|
|
A lot of RAM (with enabled LCD ~2200 bytes) was saved by storing char []="some message" in Program memory.
|
|
In the serial communication, a #define based level of abstraction was enforced, so that it is clear that
|
|
some transfer is information (usually beginning with "echo:"), an error "error:", or just normal protocol,
|
|
necessary for backwards compatibility.
|
|
|
|
### Interrupt based temperature measurements
|
|
|
|
An interrupt is used to manage ADC conversions, and enforce checking for critical temperatures.
|
|
This leads to less blocking in the heater management routine.
|