MHD - MegaHexDelta with Duet WiFi

[Aussiephil]

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.

[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?

[T3P3Tony]

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?

[Aussiephil]

@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

[Aussiephil]

@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.

[CodonExe]

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

[Aussiephil]

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

[Aussiephil]

@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

[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

[Aussiephil]

@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