Jump to content
Ultimaker Community of 3D Printing Experts

Ultimaker Cura 3.6 - PlugIn with .pyd

Recommended Posts

Posted (edited) · Ultimaker Cura 3.6 - PlugIn with .pyd



I've been educating myself in Ultimaker Cura 3.6 by writing my own Plugin. At this point I've no problems and everything is working fine. I now decided to convert one file of my Plugin from .py to .pyd with Cython. Now Ultimaker does not even load this Plugin anymore, saying:

2019-04-05 14:46:01,337 - ERROR - [MainThread] UM.Logger.logException [88]:     from . import J_Do_It_2
2019-04-05 14:46:01,337 - ERROR - [MainThread] UM.Logger.logException [88]: ImportError: cannot import name 'J_Do_It_2'


Does Ultimaker Cura not support Plugins with precompiled/converted .pyd files?


The main file MPFWriter.py


import tempfile
import os
import io

from typing import cast
from . import J_Do_It_2

from UM.Application import Application
from UM.Logger import Logger
from UM.Mesh.MeshWriter import MeshWriter #The writer we need to implement.
from UM.MimeTypeDatabase import MimeTypeDatabase, MimeType
from UM.PluginRegistry import PluginRegistry #To get the g-code writer.

class MPFWriter(MeshWriter):

    version = 3

    def __init__(self):

    def write(self, stream, nodes, mode = MeshWriter.OutputMode.TextMode):

        #Store the g-code from the scene.
        temp_gcode = tempfile.NamedTemporaryFile("w", delete=False)
        name = temp_gcode.name
        gcode_writer = cast(MeshWriter, PluginRegistry.getInstance().getPluginObject("GCodeWriter"))
        success = gcode_writer.write(temp_gcode, None)
        #converter = J_Do_It.DoIt()
        if not success: #Writing the g-code failed. 
            return False

        path = os.path.dirname(os.path.abspath(__file__))

            head = io.open((str(path) +"/HeadAndEnd/head.txt"), "r", encoding='utf8')
            end = io.open((str(path) + "/HeadAndEnd/end.txt"), "r", encoding='utf8')
        except EnvironmentError as e:
            if head:
                Logger.log("e", "Cannot open or find HeadFile")
            elif end:
                Logger.log("e", "Cannot open or find EndFile")
                Logger.log("Something went wrong")
            return False

            J_Do_It_2.DoIt.openFile(name, stream.name, head, end)
        except EnvironmentError as e:
            if temp_gcode:
                Logger.log("e", "Cannot create temp-File {pathTempFile}".format(temp_gcode=temp_gcode))
            return False


        return True


The calculator file J_Do_It_2.pyd (before it is converted into pyd and shortened):

import io

class DoIt():


    def openFile(self, pathSource, pathTarget, head, end):
        #do something

    def readLine(self, line):

        #do something

    def replaceVars(self, elements):
        #do something

    def calculate(self, value, containsXYZ):
        #do something


Edited by MadCooper
  • Share this post

    Link to post
    Share on other sites
    Posted · Ultimaker Cura 3.6 - PlugIn with .pyd

    What do you want to achieve by converting the plugin to a pyd file?


    All plugins are distributed as .py files. You may be able to get it to work with .pyc files instead if you want to obfuscate your code.

  • Share this post

    Link to post
    Share on other sites
    Posted · Ultimaker Cura 3.6 - PlugIn with .pyd
    On ‎4‎/‎5‎/‎2019 at 8:02 PM, ahoeben said:

    What do you want to achieve by converting the plugin to a pyd file?

    A Professor (An engineer) asked me, if Plugins can use .DLL files. Searching for how to use .dll-files in python, I found this hole .pyd thing. So, I just wanted to try it. 


    And yes, i am working on Windows. 

  • Share this post

    Link to post
    Share on other sites
    Posted · Ultimaker Cura 3.6 - PlugIn with .pyd

    @MadCooper There seems to be something missing in your code for your pyd file. Cura (actually the embedded Python interpreter) should be able to pick it up normally. I've embedded PyWin32 into my CAD plugins and it comes with many pyd files and works fine.

    You probably want to take a look into SWIG or Cython to be able to code with fewer hassles and let one of these projects generate the C/C++ code you need.


    Maybe this is something for you! 🙂 

  • Share this post

    Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • Talking additive | The 3D printing podcast
        Why should we be the only ones asking questions? Join us and ask Jabil all your questions on September 22nd 5pm CET
          • Like
        • 3 replies
      • Ultimaker masterclass: Optimizing your Ultimaker Cura workflow
        Save your seat for either broadcast on September 23.
        What will you learn?
        · Best practices for iterative print preparation and every lesson you should learn from each print
        · The right way to use per-object settings and when they are most useful
        · Easy-to-use resources for anyone who wants to develop their own printer definitions, plugins, or print profiles
        · How to optimize print profile settings and whether to “keep” or “discard” changes
        · When is the right time to export your drawing from CAD? (Based on Ultimaker Cura’s surprising power as 3D control software)
        · And a whole lot more tips and tricks!
        How can I join?
        This free masterclass will take place twice:
        1. 11am CEST (5pm SGT, 5am EDT)
        2. 5pm CEST (11am EDT, 8am PDT, 11pm SGT)
          • Like
        • 0 replies
      • Do you use 3D printing at work? Let us know
        It doesn't matter if you are using 1 Ultimaker or 10, there is inspiration in everything. We're looking for ...
        • 1 reply
    • Create New...