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The advantage to single wall (or double wall) calibration cubes is that you can really dial in your printer to produce spot-on single wall (or double wall) calibration cubes.
The disadvantage is that when printing anything else, it doesn't really work.
If you have your E-steps dialed in then you are done. No further Flow calibration is necessary or required.
It's easy to calculate the volume of an extrusion. L x W x H. If the extrusion is 30.06 long x .4 wide x .2 high then that is 2.405mm³. It is also easy to calculate the volume of 1mm of 1.75 filament. PI x r² = 2.405mm³. When the ratio of VolumeOfExtrusion to VolumeOfFilament is 1:1 then Flow is at 100%. In essence "It needs this much plastic so that's how much I'm going to give it."
If you decide that the extrusion should only be 85% of what is actually required - then you are building in an under-extrusion of 15%.
There is no difference between calling for 85% Flow, adjusting the E-steps to 85%, or telling Cura "I want the line width at .40 but I only want enough plastic for an extrusion width of .34".
The top skin is a good indicator of Flow. The best tool to check it with is a microscope but a magnifying glass will tell you a lot as well. At 85% Flow the extrusions of a top skin will not be welded together and you will see the cross-hatch of the layer below through the gaps in the top layer. That will severely impact the strength of the print.
But your single wall calibration cube prints will be perfect.
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GregValiant 697
The advantage to single wall (or double wall) calibration cubes is that you can really dial in your printer to produce spot-on single wall (or double wall) calibration cubes.
The disadvantage is that when printing anything else, it doesn't really work.
If you have your E-steps dialed in then you are done. No further Flow calibration is necessary or required.
It's easy to calculate the volume of an extrusion. L x W x H. If the extrusion is 30.06 long x .4 wide x .2 high then that is 2.405mm³. It is also easy to calculate the volume of 1mm of 1.75 filament. PI x r² = 2.405mm³. When the ratio of VolumeOfExtrusion to VolumeOfFilament is 1:1 then Flow is at 100%. In essence "It needs this much plastic so that's how much I'm going to give it."
If you decide that the extrusion should only be 85% of what is actually required - then you are building in an under-extrusion of 15%.
There is no difference between calling for 85% Flow, adjusting the E-steps to 85%, or telling Cura "I want the line width at .40 but I only want enough plastic for an extrusion width of .34".
The top skin is a good indicator of Flow. The best tool to check it with is a microscope but a magnifying glass will tell you a lot as well. At 85% Flow the extrusions of a top skin will not be welded together and you will see the cross-hatch of the layer below through the gaps in the top layer. That will severely impact the strength of the print.
But your single wall calibration cube prints will be perfect.
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Share on other sites