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Raspberry Pi unattended 3d printing with auto ejection GCODE sender
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This project is a bash script that manages automatic downloading of GCODE from a web server and printing that to a 3d print. It uses the command line GCODE sender from pronterface.

The files we have added are as follows:



end.gcode is the script that retrives GCODe from the web server and manages the printing process. is the file to start the script in the background. It will run untill the is run.

The GCODE files are broken up to make it possible to controll the 3d printers auto ejection system.

start1.gcode opens the trap door all the way ensuring the print bead is clear befor closing and opeing it just enoughf for the 2d printer to put a sheet of paper on the print bed.

start2.gcode fully close the trap door.

The download file from the web server is run after start2.gcode. It will be simple to modify the bash script to make it work with other devices.

end.gcode fully opens the trap door.

It includes several gcode files in the root of this directory that manage the automatic retrival of jobs and the controll of a 3d printers automatic ejection mechanisom.

A regular paper printer is required to make this work with out modification. The paper printer is used to create the dispobal print bed for the 3d printed object. It also prints out the details for the print job such as user name and job ID.

The script can be modified and the gcode files edited to make them specific to your printer. The top of the script contains the following variables that must be set.

You must change the name of the printer and the web server URL. You can also set the max size for your printer. The print queue will check the max size to dermin if there are any obs that can be given to the printer.


There is still some work to do as far as making an nice install script that can be run on the pi. The install script will have to install the cups printer services and the HP drivers as HP printers were the only ones I was able to get working on the rasbery pi.

The rest of the readme file here is specific to printrun. Print run is the python package that provides the actual gcode sender. It runs on linux and is compadible with the rasbery pi.

############################################################################# This is all pronter face print run stuff from the original clone. I do want to thank these people for making the who command line gocode sender that works on linux including the rasbery pi.

Printrun consists of printcore, pronsole and pronterface, and a small collection of helpful scripts.

  • is a library that makes writing reprap hosts easy
  • is an interactive command-line host software with tabcompletion goodness
  • is a graphical host software with the same functionality as pronsole


This section suggests using precompiled binaries, this way you get everything bundled into one single package for an easy installation.

If you want the newest, shiniest features, you can run Printrun from source using the instructions further down this README.


A precompiled version is available at

Mac OS X

A precompiled version is available at



You can run Printrun directly from source. Fetch and install the dependencies using

  1. sudo apt-get install python-serial python-wxgtk2.8 python-pyglet python-numpy cython python-libxml2 python-gobject python-dbus python-psutil python-cairosvg libpython-dev git

Clone the repository

git clone

and you can start using Printrun from the Printrun directory created by the git clone command.

Users of Ubuntu Xenial Xerus or later and Debian Jessie or later won't find the package "python-wxgtk2.8" available, having been replaced by "python-wxgtk3.0". Running Printrun with "python-wxgtk3.0" instead, is possible but it is known to be affected by issue #615.

A Printrun preliminary package is already available in Ubuntu Yakkety Yak and Debian Stretch/Sid repositories. Please be aware that this initial package is also known to be affected by issue #615.

Chrome OS

You can use Printrun via crouton ( ). Assuming you want Ubuntu Trusty, you used probably sudo sh -e ~/Downloads/crouton -r trusty -t xfce to install Ubuntu. Fetch and install dependencies with the line given above for Ubuntu/Debian, and obtain the source via git clone.

By default you have no access to the serial port under Chrome OS crouton, so you cannot connect to your 3D printer. Add yourself to the serial group within the linux environment to fix this

sudo usermod -G serial -a <username>

where <username> should be your username. Log out and in to make this group change active and allow communication with your printer.


You can install Printrun from official packages. Install the whole package using

sudo yum install printrun

Or get only apps you need by

sudo yum install pronsole or pronterface or plater

Adding --enablerepo updates-testing option to yum might give you newer packages (but also not very tested).

You can also run Printrun directly from source, if the packages are too old for you. Fetch and install the dependencies using

  1. sudo yum install pyserial wxPython python-pyglet python-cairosvg

Optional: sudo yum install skeinforge simarrange


Packages are available in AUR. Just run

yaourt printrun

and enjoy the pronterface, pronsole, ... commands directly.


Run Printrun for source if you want to test out the latest features.


To use pronterface, you need:

  • python (ideally 2.6.x or 2.7.x),
  • pyserial (or python-serial on ubuntu/debian)
  • pyreadline (not needed on Linux) and
  • argparse (installed by default with python >= 2.7)
  • wxPython (some features such as Tabbed mode work better with wx 2.9)
  • pyglet
  • numpy (for 3D view)
  • pycairo (to use Projector feature)
  • cairosvg (to use Projector feature)
  • dbus (to inhibit sleep on some Linux systems)

Please see specific instructions for Windows and Mac OS X below. Under Linux, you should use your package manager directly (see the "GETTING PRINTRUN" section), or pip:

pip install -r requirements.txt

Cython-based G-Code parser

Printrun default G-Code parser is quite memory hungry, but we also provide a much lighter one which just needs an extra build-time dependency (Cython), plus compiling the extension with:

python build_ext --inplace

The warning message

WARNING:root:Memory-efficient GCoder implementation unavailable: No module named gcoder_line

means that this optimized G-Code parser hasn't been compiled. To get rid of it and benefit from the better implementation, please install Cython and run the command above.


Download the following, and install in this order:


For the last one, you will need to unpack it, open a command terminal, go into the the directory you unpacked it in and run python install

Mac OS X Lion

  1. Ensure that the active Python is the system version. (brew uninstall python or other appropriate incantations)
  2. Download an install [wxPython2.8-osx-unicode] matching to your python version (most likely 2.7 on Lion, check with: python --version) from: Known to work PythonWX:
  3. Download and unpack pyserial from
  4. In a terminal, change to the folder you unzipped to, then type in: sudo python install
  5. Repeat 4. with http://

The tools will probably run just fine in 64bit on Lion, you don't need to mess with any of the 32bit settings. In case they don't, try 5. export VERSIONER_PYTHON_PREFER_32_BIT=yes in a terminal before running Pronterface

Mac OS X (pre Lion)

A precompiled version is available at

  1. Download and install

  2. Grab the source for pyserial from

  3. Unzip pyserial to a folder. Then, in a terminal, change to the folder you unzipped to, then type in:

    defaults write Prefer-32-Bit -bool yes

    sudo python install

Alternatively, you can run python in 32 bit mode by setting the following environment variable before running the command:

This alternative approach is confirmed to work on Mac OS X 10.6.8.


sudo python install

Then repeat the same with http://



When you're done setting up Printrun, you can start in the directory you unpacked it. Select the port name you are using from the first drop-down, select your baud rate, and hit connect. Load an STL (see the note on skeinforge below) or GCODE file, and you can upload it to SD or print it directly. The "monitor printer" function, when enabled, checks the printer state (temperatures, SD print progress) every 3 seconds. The command box recognizes all pronsole commands, but has no tabcompletion.

If you want to load stl files, you need to install a slicing program such as Slic3r or Skeinforge and add its path to the settings.

Slic3r integration

To invoke Slic3r directly from Pronterface your slicing command (Settings > Options > External Commands > Slice Command) should look something like slic3r $s -o $o. If Slic3r is properly installed "slic3r" will suffice, otherwise, replace it with the full path to Slic3r's executable.

If the Slic3r integration option (Settings > Options > User interface > Enable Slic3r integration) is checked a new menu will appear after application restart which will allow you to choose among your previously saved Slic3r Print/Filament/Printer settings.


To use pronsole, you need:

  • python (ideally 2.6.x or 2.7.x),
  • pyserial (or python-serial on ubuntu/debian) and
  • pyreadline (not needed on Linux)

Start pronsole and you will be greeted with a command prompt. Type help to view the available commands. All commands have internal help, which you can access by typing "help commandname", for example "help connect"

If you want to load stl files, you need to put a version of skeinforge (doesn't matter which one) in a folder called "skeinforge". The "skeinforge" folder must be in the same folder as


To use printcore you need python (ideally 2.6.x or 2.7.x) and pyserial (or python-serial on ubuntu/debian) See pronsole for an example of a full-featured host, the bottom of for a simple command-line sender, or the following code example:

#to send a file of gcode to the printer
from printrun.printcore import printcore
from printrun import gcoder
p=printcore('/dev/ttyUSB0',115200) # or p.printcore('COM3',115200) on Windows
gcode=[i.strip() for i in open('filename.gcode')] # or pass in your own array of gcode lines instead of reading from a file
gcode = gcoder.LightGCode(gcode)
p.startprint(gcode) # this will start a print

#If you need to interact with the printer:
p.send_now("M105") # this will send M105 immediately, ahead of the rest of the print
p.pause() # use these to pause/resume the current print
p.disconnect() # this is how you disconnect from the printer once you are done. This will also stop running prints.


Printrun provides two platers: a STL plater ( and a G-Code plater (


When the 3D viewer is enabled, the controls are the following:

  • Mousewheel: zoom (Control reduces the zoom change steps)
  • Shift+mousewheel: explore layers (in print gcode view ; Control key makes layer change by increments of 10 instead of 1) or rotate object (in platers)
  • Left-click dragging: rotate view
  • Right-click dragging: pan view
  • Shift + left-click dragging: move object (in platers)
  • Page up/down keys: zoom (Control reduces the zoom change steps)
  • Up/down keys: explore layers
  • R key: reset view
  • F key: fit view to display entire print
  • C key: toggle "display current layer only" mode (in print gcode view)


pronterface and pronsole start a RPC server, which runs by default on localhost port 7978, which provides print progress information. Here is a sample Python script querying the print status:

import xmlrpclib

rpc = xmlrpclib.ServerProxy('http://localhost:7978')
print rpc.status()


Build dimensions

Build dimensions can be specified using the build_dimensions option (which can be graphically edited in Pronterface settings). This option is formed of 9 parameters: 3 for the build volume dimensions, 3 for the build volume coordinate system offset minimum, 3 for the endstop positions.

The default value is 200x200x100+0+0+0+0+0+0, which corresponds to a 200x200mm (width x height) bed with 100mm travel in Z (there are the first three numbers) and no offset. The absolute coordinates system origin (0,0,0) is at the bottom left corner on the bed surface, and the top right corner on the bed surface is (200,200,0).

A common practice is to have the origin of the coordinate system (0,0,0) at the center of the bed surface. This is achieved by using the next three parameters, for instance with 200x200x100-100-100+0+0+0+0. In this case, the bottom left corner of the bed will be at (-100,-100,0) and the top right one at (100,100,0).

These two sets of settings should be sufficient for most people. However, for some specific complicated setups and GCodes and some features, we might also need the endstops positions for perfect display. These positions (which are usually 0,0,0, so if you don't know you probably have a standard setup) are specified in absolute coordinates, so if you have your bed starting at (-100,-100,0) and your endstops are 10mm away from the bed left and right and the Z endstop 5mm above the bed, you'll want to set the endstops positions to (-110,-110,5) for this option.


Macros in pronsole and pronterface

To send simple G-code (or pronsole command) sequence is as simple as entering them one by one in macro definition. If you want to use parameters for your macros, substitute them with {0} {1} {2} ... etc.

All macros are saved automatically immediately after being entered.

Example 1, simple one-line alias:

PC> macro where M114

Instead of having to remember the code to query position, you can query the position:

PC> where

Example 2 - macros to switch between different slicer programs, using "set" command to change options:

PC> macro use_slicer
Enter macro using indented lines, end with empty line
..> set sliceoptscommand Slic3r/slic3r.exe --load slic3r.ini
..> set slicecommand Slic3r/slic3r.exe $s --load slic3r.ini --output $o
Macro 'use_slicer' defined
PC> macro use_sfact
..> set sliceoptscommand python skeinforge/skeinforge_application/
..> set slicecommand python skeinforge/skeinforge_application/skeinforge_utilities/ $s
Macro 'use_sfact' defined

Example 3, simple parametric macro:

PC> macro move_down_by
Enter macro using indented lines, end with empty line
..> G91
..> G1 Z-{0}
..> G92

Invoke the macro to move the printhead down by 5 millimeters:

PC> move_down_by 5

For more powerful macro programming, it is possible to use python code escaping using ! symbol in front of macro commands. Note that this python code invocation also works in interactive prompt:

PC> !print "Hello, printer!"
Hello printer!

PC> macro debug_on !self.p.loud = 1
Macro 'debug_on' defined
PC> debug_on
PC> M114
SENT:  M114
X:0.00Y:0.00Z:0.00E:0.00 Count X:0.00Y:0.00Z:0.00
RECV:  X:0.00Y:0.00Z:0.00E:0.00 Count X:0.00Y:0.00Z:0.00
RECV:  ok

You can use macro command itself to create simple self-modify or toggle functionality:

Example: swapping two macros to implement toggle:

PC> macro toggle_debug_on
Enter macro using indented lines, end with empty line
..> !self.p.loud = 1
..> !print "Diagnostic information ON"
..> macro toggle_debug toggle_debug_off
Macro 'toggle_debug_on' defined
PC> macro toggle_debug_off
Enter macro using indented lines, end with empty line
..> !self.p.loud = 0
..> !print "Diagnostic information OFF"
..> macro toggle_debug toggle_debug_on
Macro 'toggle_debug_off' defined
PC> macro toggle_debug toggle_debug_on
Macro 'toggle_debug' defined

Now, each time we invoke "toggle_debug" macro, it toggles debug information on and off:

PC> toggle_debug
Diagnostic information ON

PC> toggle_debug
Diagnostic information OFF

When python code (using ! symbol) is used in macros, it is even possible to use blocks/conditionals/loops. It is okay to mix python code with pronsole commands, just keep the python indentation. For example, following macro toggles the diagnostic information similarily to the previous example:

!if self.p.loud:
  !self.p.loud = 0
  !print "Diagnostic information OFF"
  !self.p.loud = 1
  !print "Diagnostic information ON"

Macro parameters are available in '!'-escaped python code as locally defined list variable: arg[0] arg[1] ... arg[N]

All python code is executed in the context of the pronsole (or PronterWindow) object, so it is possible to use all internal variables and methods, which provide great deal of functionality. However the internal variables and methods are not very well documented and may be subject of change, as the program is developed. Therefore it is best to use pronsole commands, which easily contain majority of the functionality that might be needed.

Some useful python-mode-only variables:

!self.settings - contains all settings, e.g. 
  port (!self.settings.port), baudrate, xy_feedrate, e_feedrate, slicecommand, final_command, build_dimensions
  You can set them also via pronsole command "set", but you can query the values only via python code.
!self.p - printcore object (see USING PRINTCORE section for using printcore object)
!self.cur_button - if macro was invoked via custom button, the number of the custom button, e.g. for usage in "button" command
!self.gwindow - wx graphical interface object for pronterface (highly risky to use because the GUI implementation details may change a lot between versions)

Some useful methods:

!self.onecmd - invokes raw command, e.g. 
    !self.onecmd("move x 10")
    !self.onecmd("!print self.p.loud")
    !self.onecmd("button "+self.cur_button+" fanOFF /C cyan M107")
!self.project - invoke Projector


Pronsole and the console interface in Pronterface accept a number of commands which you can either use directly or inside your G-Code. To run a host command from inside a G-Code, simply prefix it with ;@.

List of available commands:

  • pause: pauses the print until the user resumes it
  • run_script scriptname [arg1 ...]: runs a custom script or program on the host computer. This can for instance be used to produce a sound to warn the user (e.g. run_script beep -r 2 on machines were the beep util is available), or to send an email or text message at the end of a print. The $s token can be used in the arguments to get the current gcode file name
  • run_gcode_script scripname [arg1 ...]: same as run_script, except that all lines displayed by the script will be interpreted in turn (so that G-Code lines will be immediately sent to the printer)
  • shell pythoncommand: run a python command (can also be achieved by doing !pythoncommand)
  • set option value: sets the value of an option, e.g. set mainviz 3D
  • connect
  • block_until_online: wait for the printer to be online. For instance you can do python -e "connect" -e "block_until_online" -e "upload object.gcode" to start pronsole, connect for the printer, wait for it to be online to start uploading the object.gcode file.
  • disconnect
  • load gcodefile
  • upload gcodefile target.g: upload gcodefile to target.g on the SD card
  • slice stlfile: slice stlfile and load the produced G-Code
  • print: print the currently loaded file
  • sdprint target.g: start a SD print
  • ls: list files on SD card
  • eta: display remaining print time
  • gettemp: get current printer temperatures
  • settemp: set hotend target temperature
  • bedtemp: set bed target temperature
  • monitor: monitor printer progress during a print
  • tool K: switch to tool K
  • move xK: move along x axis (works with other axes too)
  • extrude length [speed]
  • reverse length [speed]
  • home [axis]
  • off: turns off fans, motors, extruder, heatbed, power supply
  • exit


Printrun is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Printrun is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Printrun.  If not, see <>.

All scripts should contain this license note, if not, feel free to ask us. Please note that files where it is difficult to state this license note (such as images) are distributed under the same terms.