MHD - MegaHexDelta with Duet WiFi



  • It's hexagonal framed, it's a Delta configuration and it's rather Mega in size.

    I guess i can also say after the last couple months it's good for a mega headache as well 🙂

    It's still unfinished with the doors to be completed to enable a heated enclosure.

    Essential facts:
    Duet WiFi
    PanelDue
    Mini Height Sensor
    2040 T-Slot framing
    20mm rods, 1600mm long
    lm20uu bearings
    custom bearing carriages
    10mm x 8mm Carbon fibre rods - 674mm long
    Max print height at bed edge @ 550mm
    Bed is 600 x 650 mm
    1200W AC silicon bed heater 500mm in diameter.
    Nema23 motors
    10mm wide GT2 belts, black ones now, belts are @ 3M long
    Titan Extruder in a flying configuration.
    200mm of bowden length
    Hotend: Dyzend
    Nozzle: Current 0.6mm
    Hotend cooling: Remote radial fan, via 10mm ID silicon tube.

    In the above photo the Duet Wifi is in it's fan cooled case but not yet mounted to side of machine. The PanelDue is on the end of 2M of cable to allow it to be moved around as needed, handy for doing config stuff.

    A view looking down towards the bed

    The top of the machine has:
    Spool holder and filament guide.
    Printed pulley arrangement for the extruder counterweight
    Remote air feed fan at rear
    and to the left some yet to be enclose cabling, all cables are quick connected using plugable connectors.

    To watch prints in progress I bought a tiny surveillance cam, IP POE based with a near 180 deg field of view

    The video is full HD and this is a screen grab from vlc

    The item being printed is 350mm in diameter and is going to be a wheel for my wheelbarrow….. just because I can i guess.

    BTW that is translucent PLA printed direct on Kapton tape, bed at 70c,



  • The Heat bed setup:
    The entire bed setup starts with the 32mm of MDF (high density stuff) that sits on 3 levelling points attached to the non carriage towers
    I then have 12mm of cork tiles that have a cutout for the power cables to the silicon pad enabling the entire plate to sit flat.
    on top of that is two 3mm layers of Ceramic Fibre paper, one layer is cutout to match the 3mm thick heat pad whilst one is across the entire cork layer.
    The heat bed is 8mm thick Aluminium tooling plate.

    I was initially concerned that the 500mm diameter heat pad wasn't heating evenly but as this image from the FLIR camera shows it's actually pretty good. Yes the outer edge is a touch cooler but the reality is that I don;t expect to get that far out very often and I do expect once it's all enclosed it will become more even.



  • Well done sir! Well done.
    You have been busy.
    Are those plumb bobs dual purpose for both positioning the aluminum extrusions normal to the bed and the counter weights for the flying extruder?


  • administrators

    Phil
    Very cool! are you using mag-balls with the springs as a backup?
    Also interested to see what flowrate you are getting through the silicone tube - presumably enough for printing PLA, is the Dyzend all metal?



  • @Toddimus:

    Well done sir! Well done.
    You have been busy.
    Are those plumb bobs dual purpose for both positioning the aluminum extrusions normal to the bed and the counter weights for the flying extruder?

    Nope, they are single purpose only to confirm the extrusions are AND remain vertical, to which end the ones on the X/Y towers are staying in place.

    The counter weight for the flying extruder is at the back of the machine and is believe it or not a 12" adjustable spanner 🙂 it was the closest thing in weight at the time and I have a couple anyway.

    Cheers



  • @T3P3Tony:

    Phil
    Very cool! are you using mag-balls with the springs as a backup?

    Nope, as per the below photo, the rods are capped with the printed cups at both ends and the balls are mounted to the carriages and effector and are plain steel threaded balls 10mm in size.

    @T3P3Tony:

    Phil
    Also interested to see what flowrate you are getting through the silicone tube - presumably enough for printing PLA, is the Dyzend all metal?

    The Dyzend is all metal heat break.

    I have nothing to measure actual flow rate but the fan even at 50% pumps more than enough air to fully cool the heatsink. I have ensured that the airflow coming in is fully isolated from escaping towards the heater/hotend itself and is purely cooling what it should.
    I had no issues with PLA even at the elevated temps i'm using.

    btw still printing all my PLA stuff without a cooling fan for the filament at the moment.



  • I think my Rostock Max V2 can fit inside your build envelope! Very nice machine, thanks for showing us!



  • Well I got the basic enclosure completed with some sealing to be done. Finally managed to print some ABS parts the last couple days.
    Here is a couple parts for the MPCNC build at 88mm in build height and looking OK from the camera view

    With the heat bed at 103c and the abs at 250c
    The chamber is holding around 34 to 36c or 22-24 above ambient at the moment, hopefully for summer no chamber heater will be needed but at least for cooler days and nights looks like some additional heating may be needed or better sealing 🙂



  • @CodonExe:

    I think my Rostock Max V2 can fit inside your build envelope! Very nice machine, thanks for showing us!

    Ta, one thing i'd like to try once I have the heated chamber dialled in is to print one piece bottom and top delta frames. Might not be very cost effective but it would be a cool little project.

    Cheers


  • administrators

    Hi Phil

    If you want to print delta frames then you should check out @RichRap's #3dr project if you have not already seen that:
    http://richrap.blogspot.co.uk/2013/07/3dr-reprap-delta-printer-part-1-release.html

    Its currently divided into parts but you could reduce the part counts by printing the top and bottom in single pieces



  • @T3P3Tony:

    Hi Phil

    If you want to print delta frames then you should check out @RichRap's #3dr project if you have not already seen that:
    http://richrap.blogspot.co.uk/2013/07/3dr-reprap-delta-printer-part-1-release.html

    Its currently divided into parts but you could reduce the part counts by printing the top and bottom in single pieces

    Thanks Tony,

    I have followed Richards blog/site for quite a while, he's mega delta is the inspiration for my large design.

    I'll likely put any real design work on hold now till next year as I gear up for christmas lights display time


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