best size filament to use ? April 05, 2015 11:28AM |
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Re: best size filament to use ? April 05, 2015 12:11PM |
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Re: best size filament to use ? April 05, 2015 02:33PM |
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Re: best size filament to use ? April 06, 2015 06:06AM |
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Re: best size filament to use ? April 06, 2015 12:58PM |
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A common misconception about printing with high flow rates is that 3mm filament is going to be better than 1.75mm. This makes intuitive sense, larger prints so use larger filament. However in reality 1.75mm filament can be melted significantly faster than 3mm filament, giving it a decisive advantage in flow rate. This is because 1.75mm filament has a much higher surface area per unit volume. As we increase filament diameter the surface area increases linearly, but the volume increases by a power of 2. This means that we can melt thinner filament much more quickly than thicker filament.
Re: best size filament to use ? April 06, 2015 07:41PM |
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Re: best size filament to use ? April 06, 2015 09:28PM |
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Re: best size filament to use ? April 07, 2015 02:51AM |
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Re: best size filament to use ? April 07, 2015 04:36AM |
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Re: best size filament to use ? April 07, 2015 06:17AM |
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Zavashier
No matter the tolerance, because you're meant to calibrate your extruder and your flow properly, so the output is constant, whatever the diameter of the filament. Otherhand, the melted filament expands. The smaller the diameter, the less friction, the less spring effect, the less tension applied to the printhead.
Re: best size filament to use ? April 07, 2015 07:20AM |
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Re: best size filament to use ? April 07, 2015 10:02AM |
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Re: best size filament to use ? April 08, 2015 03:05AM |
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Zavashier
No matter the tolerance, because you're meant to calibrate your extruder and your flow properly, so the output is constant, whatever the diameter of the filament. Otherhand, the melted filament expands. The smaller the diameter, the less friction, the less spring effect, the less tension applied to the printhead.
Re: best size filament to use ? April 09, 2015 04:17AM |
Registered: 9 years ago Posts: 1,011 |
Actualy, I don't calibrate my extruder like you say. Obviously, it's just the half way of a proper calibration. First, I calibrate the steps per mm, it's the input calibration. Then I enter the measured filament diameter (an average value within the 2 first meters of the spool). Then, and that's what most of people does not do, I calibrate the fused filament output to adjust the flow value of the slicer to get the expected output dimensions. That's what I call calibrating properly an extruder.Quote
danielis
@Zavashier: I think it is the other way round. You calibrate your extruder by E Steps per mm on the input side. So the only thing yout slicer knows is how much is going in the extruder. And therefore the slicer thinks the filament ha a constant diameter.
Re: best size filament to use ? April 10, 2015 01:10AM |
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Re: best size filament to use ? April 11, 2015 12:05AM |
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Zavashier
A system able to measure with precision the diameter of the filament in real time should cost at last like 2 or 3 repraps. Otherhand, actualy no firmware can manage filament variations on the fly. Anyways, filament variations should be within a small percentage (or change your provider/brand), that won't affect much the print dimensions. You must admit the FDM technology has its limitations.
Re: best size filament to use ? April 11, 2015 05:55AM |
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Re: best size filament to use ? April 12, 2015 01:46AM |
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Zavashier
Yep, we need just a firmware to manage that values. But do that small variation percentage on the filament worth the investment ? The diameter variation of the filament is less than 3%. Otherwise, the expansion of the fused filament is about 20%. I guess it anihilates the diameter variation factor.
Re: best size filament to use ? April 12, 2015 06:54AM |
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Re: best size filament to use ? April 12, 2015 07:43AM |
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Re: best size filament to use ? April 14, 2015 01:26AM |
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Ralph.Hilton
2.3% not 23%