Difference between revisions of "Laser CNC"

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(Problem1: python 2.7 vs 3 for gcodetools)
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====Problem1: python 2.7 vs 3 for gcodetools====
 
====Problem1: python 2.7 vs 3 for gcodetools====
* There is an extension for Gcode export.  
+
Gcodetools is an extension for Inkscape for G-code export.  
* It appears to be written for Python 2, while the newest Inkscape appears to be running Python 3. There might be problems with running the extensions. Change the default version for python to be 2.7 like this:
+
It appears to be written for Python 2, while the newest Inkscape appears to be running Python 3. There might be problems with running the extensions. Change the default version for python to be 2.7 like this:
** Open Inkscape preferences, usually here: <code>~/.config/inkscape/preferences.xml</code>
+
* Open Inkscape preferences, usually here: <code>~/.config/inkscape/preferences.xml</code>
** Search for  
+
* Search for  
 
  <group
 
  <group
 
     id="extensions"
 
     id="extensions"
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     org.ekips.filter.gears.pitch="20"
 
     org.ekips.filter.gears.pitch="20"
 
     org.ekips.filter.gears.angle="20" />
 
     org.ekips.filter.gears.angle="20" />
** Change to - add the following:
+
* Change to - add the following:
 
  <group
 
  <group
 
     id="extensions"
 
     id="extensions"
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     org.ekips.filter.gears.pitch="20"
 
     org.ekips.filter.gears.pitch="20"
 
     org.ekips.filter.gears.angle="20" />
 
     org.ekips.filter.gears.angle="20" />
** More info here: https://wiki.inkscape.org/wiki/index.php/Extension_Interpreters
+
* More info here: https://wiki.inkscape.org/wiki/index.php/Extension_Interpreters
  
 
===Problem2: unittouu===
 
===Problem2: unittouu===

Revision as of 00:27, 6 January 2020

Laser Cutting and engraving

Life cycle:

  1. Design the 2D object (Inkscape, or any graphical editor)
  2. Export to a compatible format: Gcode or DXF
    • Use Inkscape extensions to generate the g-code, such as
    • Gcodetools - included with Inkscape, but not as well supported
    • Jtech Laser Tool plugin
  3. Send it (the G-code program or DXF file) to the laser cutter. This is usually done with another program, such as

Inkscape for Laser cutting

A few short and useful tutorial videos:

Inkscape extensions: Gcodetools

The following notes are for using Inkscape on Linux, e.g. Ubuntu. On Windows or MacOS you may encounter similar problems, depending on your software, e.g. Python configuration.

Problem1: python 2.7 vs 3 for gcodetools

Gcodetools is an extension for Inkscape for G-code export. It appears to be written for Python 2, while the newest Inkscape appears to be running Python 3. There might be problems with running the extensions. Change the default version for python to be 2.7 like this:

  • Open Inkscape preferences, usually here: ~/.config/inkscape/preferences.xml
  • Search for
<group
    id="extensions"
    …
    org.ekips.filter.gears.pitch="20"
    org.ekips.filter.gears.angle="20" />
  • Change to - add the following:
<group
    id="extensions"
    python-interpreter="/usr/bin/python2.7"
    …
    org.ekips.filter.gears.pitch="20"
    org.ekips.filter.gears.angle="20" />

Problem2: unittouu

After running gcodetools extension you may get the error:

AttributeError: 'module' object has no attribute 'unittouu'

The solution is to update the gcodetools.py as follows. For me, this was on the line 5864 where inkex.unittouu() is called. The problem is that it is referenced as

doc_height = inkex.unittouu(...

Fix this as follows:

doc_height = self.unittouu(...

Inkscape extensions: JTechPhotonics

Alternative, easy to use extension for inkscape to create gcode is J Tech Laser Tool Plugin

Resources