26 Reply by elmoret

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Re: Assembled Version- Weaving

Orb wrote:
elmoret wrote:

What hopper funnel are you using? The hopper funnel STL I include should sit on top of the wood enclosure itself. There should be nothing promoting a sideways tipping.

Mine is one of my own design, and like others I have seen, is attached to the hopper.

Well there ya go. smile

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27 Reply by Leghk (edited by Leghk 2013-08-23 05:07:08)

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Re: Assembled Version- Weaving

The HopperFunnel v2.stl doesn't clear the ledge on my FA8 case. I glued a printed rectangle extension under the funnel that slides over the hopper and closes the gap.

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28 Reply by leonmf

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Re: Assembled Version- Weaving

Blech, I've spent hours adjusting and tweaking.  I've tried the default settings from the manual.  I've tried my own concepts.  Nothing I do seems to stop the weaving.  Even when I make it go away, it comes back.  So, the question is this, will a modest amount of weaving affect the printer's ability to extrude?

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29 Reply by leonmf

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Re: Assembled Version- Weaving

I think I finally got it.  My support configuration looks nothing like the manual, though.

I'm running 1.75 and I finally set the first support to be higher than the nozzle to force a bit of a curve into the filament and then set the seconds support to intersect that natural curve.  Before that, I could have the system perfectly smooth, walk away for ten minutes and come back to the sine waves of doom.

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30 Reply by elmoret

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Re: Assembled Version- Weaving

leonmf wrote:

I think I finally got it.  My support configuration looks nothing like the manual, though.

I'm running 1.75 and I finally set the first support to be higher than the nozzle to force a bit of a curve into the filament and then set the seconds support to intersect that natural curve.  Before that, I could have the system perfectly smooth, walk away for ten minutes and come back to the sine waves of doom.

Can you post a picture?

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31 Reply by laird

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Re: Assembled Version- Weaving

Oddly my filament _used_ to be nice and straight, but very slow extruding, with the fan blowing straight up. Now that I've angled it away, extrusion is much faster, but the filament gets into a "wave" motion, where it gets a wiggle, and then when that wiggle hits the first support it causes the end of the filament near the extruder to pivot up, stretching the filament where it's soft and creating another wave, which then repeats. I've only been able to fix it by moving the first support down and then back up by hand, in synch with the wiggle, so the filament stays straight out of the extruder. Then once it's straight it stays straight for about a yard. Then the end of the filament hits the ground, and eventually there's back-pressure sufficient to cause the filament at the extruder to wiggle again. So unless I watch carefully and make sure the filament stays straight, I get a bunch of yard-long pieces of filament with ends that I have to cut off.

I know others aren't seeing this. So what do I need to do differently?

The more I think about it, the more a vertical mounting makes more sense. Short of mounting it on a wall (hard to do at a Maker Faire, etc.) do you think it'd help to lift it to a 45 degree angle, so the filament can pretty much come straight down pulled by gravity?

32 Reply by elmoret

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Re: Assembled Version- Weaving

One difference between the OS Printing version and my version is the number of supports. Can you try using just one support, set up like the kit? Check the kit instructions for placement.

When I place the single support as described in the kit instructions, I *never* get weaving. I do need to pull it out by hand has it extrudes to keep it straight for about a foot, then it is good to go on autopilot, so to speak. You do need a clear area under the extruder for it to fall uninhibited.

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33 Reply by IanJohnson

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Re: Assembled Version- Weaving

What is going on below the table?  Is there a clear circle with the nozzle at the center, or are there table legs or other things under the table?

34 Reply by laird

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Re: Assembled Version- Weaving

IanJohnson wrote:

What is going on below the table?  Is there a clear circle with the nozzle at the center, or are there table legs or other things under the table?

The table has legs, and the floor is tiled, so there's slight resistance either from the filament end bumping into tile edges or against table legs. It's not much, but apparently enough.

Pulling it by hand for a foot would probably fix the problem, since that would avoid the initial wave that seems to trigger everything.

I just tried holding the printer up at a 45 degree angle, and it made a world of difference. I imagine being fully vertical would be even better, but that's tricky to do at a Maker Faire where I have to set up at a table.

I also tried 3mm instead of 1.75mm, and it also made a big difference. The filament comes out much faster. THough the width seems more uneven, so all is not perfect yet.

35 Reply by elmoret

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Re: Assembled Version- Weaving

You can't let it hit anything on the way down.

By "printer" do you mean extruder?

3mm filament should be slower than 1.75. Typically:

1.75mm filament: 10-18in/min
3.0mm filament: 3-6in/min

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36 Reply by laird

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Re: Assembled Version- Weaving

elmoret wrote:

You can't let it hit anything on the way down.

By "printer" do you mean extruder?

3mm filament should be slower than 1.75. Typically:

1.75mm filament: 10-18in/min
3.0mm filament: 3-6in/min

Yes, I meant to write "extruder".

With the original motor, I'm seeing the 3mm filament extrude faster than that rate, and 1.75mm filament extruding slower. Given constant volume of plastic, I'd expected that the 1.75mm filament would extrude faster than 3mm, so I'm wondering if the narrower nozzle is a factor. I've stick a 1.5mm hex key through the 1.75mm nozzle when hot, so there's no obvious blockage.

So the 1.75mm extrusion is much, much slower than expected. So I'll stick to 3mm extrusion for now. That's fine - I hope to use filastruded filament in my shiny new 3Doodler, since all of my filament for printing is 1.75mm (Replicator and, some day, QU-BD RPM).

Another possible factor is that I'd mixed in the red ABS colerant (from OS Printing) and that might have made the plastic thicker. I've switched to feeding in raw ABS, so the color is slowly fading (it's pinkish now) so it's possible that the extrusion got faster as the colerant is diluted.

37 Reply by elmoret

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Re: Assembled Version- Weaving

That is really strange. I have never, ever seen 3mm extrusion go faster than 1.75mm extrusion.

In an earlier post you mentioned you stuck a hex key half an inch in - the nozzle is deeper than that, and just pushing something in might move the debris around but not remove it.

Can you soak the 1.75mm nozzle in acetone at some point in the future, check that it is clean, and reinstall? I've never heard of 3.0 going faster than 1.75.

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38 Reply by laird

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Re: Assembled Version- Weaving

I've dramatically improved the 'weaving' by tilting the Filastruder up at a 45 degree angle, and arranging the supports so the filament is barely supported as it goes in a straight line from the extruder past the edge of the cooling fan.