Pretty impressive, i'll definitely be re-designing the hot end air duct again probably to take a 1 larger fan maybe 60mm or 2 x 40mm ones.

[www.youtube.com]


Matt

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Limited Edition Red RS Ormerod 1 #144 of 200 - RRP 1.09fw
iamburnys Ormerod Upgrades Github
Follow me on ThingiVerse My Designs

I'm very impressed. What I noticed is that they shield the nozzle heater from the airflow of the fan, and only allow the air to cool the tip of the nozzle.
I think that increasing the fan to 60mm is a great idea, it allows for more silent fans to be used, and you can achieve a larger airflow.

I'm assuming that the video is actual speed, and that it must print very slowly to allow the extrusion time to cool sufficiently to act as a support. Would it be possible to slow down to that speed when printing overhangs, but print at normal speed elsewhere? Perhaps the "bridges speed" or "gap fill" variables in Slic3r might achieve it. Cura does not appear to have equivalent variables (BICBW).

If so, it means that it would be possible to print pretty large horizontal overhangs with little or no support, and bridging should work almost perfectly over 100mm or more, vastly increasing the design possibilities, though to prevent any sag at all would need the capability of raising the Z height a small predetermined amount during the bridge and dropping it back to layer height when arriving at the far side. Perhaps future slicing software will have such a capability.

On the Ormerod it would definitely need a second fan, which is switched off or greatly reduced in speed for normal printing moves. Having that degree of cooling all the time would prevent the plastic from bonding properly to the previous layer, so I think it should only be turned on when printing in air.

Dave
(#106)

As far as extrusion goes upwards (Z+), then it will be ok. As even with sufficient cooling horizontal bridges will not be possible - that is for sure - filament will bend downwards..

Quote
moka
As far as extrusion goes upwards (Z+), then it will be ok. As even with sufficient cooling horizontal bridges will not be possible - that is for sure - filament will bend downwards..

If it can print an upward hanging thread, then with just the right amount (less) of Z+, it must be possible to print a horizontal hanging thread. The problem being that the Z will have to be brought back down to the layer height when it gets back over "solid land" again.

Dave
(#106)

So you are talking about some macros, that would identify G codes that perform extrusion for bridging and add Z to it based on length of bridge (based on some degree?) and then move don after.
I see it possible indeed, but will be a bit of an a mission tbh..

I've been quite successful doing small (17mm) bridges, as you can see from this print:



This was done using my standard slic3r settings, and the original heatsink duct and fan duct. Getting the extrusion temperature just right is important..

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Quote
dmould
...On the Ormerod it would definitely need a second fan, which is switched off or greatly reduced in speed for normal printing moves. Having that degree of cooling all the time would prevent the plastic from bonding properly to the previous layer, so I think it should only be turned on when printing in air.

Dave
(#106)

Something like this?



50mm x 15mm 12v DC blower fan model 5015S



[www.thingiverse.com]

Erik

"getting the extrusion temperature just right" What temperatures are you using?

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Ormerod 313

@DC42, that's incredible. Didn't think that was possible with an ormerod.

What is the bridge speed you use?
Mine struggles to print a 5mm bridge (at 175°c )

I'm using the slic3r default bridge speed which is 20mm/sec and a temperature of 190C apart from the first layer. You can see some of the results of experimenting with printing this model in this thread [forums.reprap.org]. The temperatures I reported there were before the hot end thermistor beta was corrected in the firmware, so they were being reported about 7C too high.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

I tried to "fan" the printing object and it did make show some improvement




The bottom edge on the right hand side fail before I had the cooling fan, and it looks good after the fan is ON.


Or maybe I wasn't calibrate my temperature correctly.

Edited 1 time(s). Last edit at 03/27/2014 01:59AM by mancinism.

Matt,
I have been looking at your one piece hot end in scad, I wanted to raise the outside chamfers on the 2 vents and reduce the height of the 2 inner walls. The reason for this is to direct some cooling onto the nozzle.
However, being a newby to any form of cad I just can't seem to work out what I need to do to achieve this. If you have some time could you point me in the right direction please
Thank you for your efforts
Paul

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appjaws - Core XYUV Duet Ethernet Duex5
firmware 3.1.1 Web Interface 3.1.1
Ormerod 1-converted to laser engraver, Duet wifi
OpenSCAD version 2020.07
slic3r-1.3.0, Simplify3D 4.1.2, Cura-4.4.1

ooh - I would be interested in this as well. Please post me the link to the stl or solidworks file and I can play as well

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Ormerod 313

Matt's very useful ormerod designs are on his github here

The design is in openscad.

If anybody modifies the hot end to direct cooling more to the nozzle would they be kind enough to explain the steps they took so I can learn from a real world example.
Thank you
Paul

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appjaws - Core XYUV Duet Ethernet Duex5
firmware 3.1.1 Web Interface 3.1.1
Ormerod 1-converted to laser engraver, Duet wifi
OpenSCAD version 2020.07
slic3r-1.3.0, Simplify3D 4.1.2, Cura-4.4.1

Matt and tracyb, did you manage to amend the hot end so some of the air could be directed towards the nozzle?

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appjaws - Core XYUV Duet Ethernet Duex5
firmware 3.1.1 Web Interface 3.1.1
Ormerod 1-converted to laser engraver, Duet wifi
OpenSCAD version 2020.07
slic3r-1.3.0, Simplify3D 4.1.2, Cura-4.4.1