Mendel90 Dibond with DuetWifi



  • Spent the weekend getting my Mendel90 up and running with my Batch 4 DuetWifi. Coming from RAMPS & OctoPi it's been an interesting couple of days. I love the all in one WiFi web interface and the IR bed peobe. I'm probably going to set up a RaspberryPi Zero with PiCam as a WiFi camera feed, perhaps with capture triggered by IO from the DuetWifi (not sure what signals yet…). Hopefully I'll find time in the week to try a test print!

    Edit:
    Other future upgrades will hopefully include

    For anyone else who is trying to get a Mendel90 (or any other cartesian printer) up and running I'm more than happy to share my experiences!



  • Some photos…


  • administrators

    Thanks for the pics and write-up. I am not sure the easiest way to add a M42 command at each layer change to trigger a camera… Depends on the slicer. Will the Raspi accept a simple pin toggling from low to high or vice versa to trigger a camera?



  • I wrote a simple python script to go through a gcode file, look for G1 Z (layer change) and add a line after starting M567 (mixing ratios) in order to get my 300 colour thingy. One could use the same process to add a M42 command.
    HTH
    Ian


  • administrators

    @T3P3Tony:

    Will the Raspi accept a simple pin toggling from low to high or vice versa to trigger a camera?

    I'm not sure if there is already a userspace application for this purpose, but I wrote a similar program about a year ago for a Freescale ARM CPU that emulated a key event when a GPIO signal changed. If you're not afraid of writing a small C program, this link might help: http://elinux.org/GPIO#Enable_GPIO_from_application_space


  • administrators

    Ian, yes post processing the gcode is certainly a way to do it. I think Cura has the ability to add layer change commands within the slicer (on my phone right now so can't check).


  • administrators

    BTW DebugBear, I am still such a fan of nophead's design for a Cartesian printer!



  • My plan was to use a simple GPIO pin trigger, with a script/program running on the raspi monitoring the pin and controlling the capturing of images. I've had some experience with this playing with my PiCam already.

    I spent a long time considering all the reprap DIY/self-build models before settling on the Mendel90. And Nophead's kit was excellent value considering the pre-cut dibond sheets.

    I am also keen to play with other styles of printers though, and have love the way deltas move when printing. Just need to find the time…



  • When using Slic3r as slicer, you can add individual commands on layer change.



  • @Pumlux:

    When using Slic3r as slicer, you can add individual commands on layer change.

    Well blow me down, so you can. I've been using Slic3r for ages but my eyes never got that far. G codes on tool changes too - now that could be useful. Thanks for pointing this out.
    Ian


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