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MiLeung

What causes solid walls with weak infill?

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23 hours ago, DidierKlein said:

Hi,

 

First thought would be infill speed set to high, personally i try to make the infill speed more like the other speeds

 

I can print walls at 90 mm/s without any problems, but not infill at 90 mm/s. This doesn't make sense to me - why can't the infill be printed as if it were a wall (i.e. solid)

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90mm/sec doesn't mean much without knowing layer height, line width and temperature.  And nozzle size.  I doubt you are comparing apples to apples here.  Also some types of infill only print one angle on one layer and the other angle on the next such that every other layer is "empty".  Basically it's purposefully printed with 50% infill.  Which type of infill pattern are you using?

 

The UM2+ and UM3 and S5 can more consistently print twice as fast as the below speeds but I don't like to push the limits.

Here are top recommended speeds for .2mm layers (twice as fast for .1mm layers) and .4mm nozzle:
20mm/sec at 200C
30mm/sec at 210C
40mm/sec at 225C
50mm/sec at 240C
The printer can do double these speeds but with huge difficulty and usually with a loss in part quality due to underextrusion.

 

So if you are printing 90mm/sec at 210C with .13mm layers, and .35mm line width, yes the printer can do this but with not much margin for error (like if there is a mild tangle or your bowden is getting old or many other minor annoyances that can push the printer into underextrusion territory.

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On 8/24/2018 at 10:25 AM, gr5 said:

90mm/sec doesn't mean much without knowing layer height, line width and temperature.  And nozzle size.  I doubt you are comparing apples to apples here.  Also some types of infill only print one angle on one layer and the other angle on the next such that every other layer is "empty".  Basically it's purposefully printed with 50% infill.  Which type of infill pattern are you using?

 

The UM2+ and UM3 and S5 can more consistently print twice as fast as the below speeds but I don't like to push the limits.

Here are top recommended speeds for .2mm layers (twice as fast for .1mm layers) and .4mm nozzle:
20mm/sec at 200C
30mm/sec at 210C
40mm/sec at 225C
50mm/sec at 240C
The printer can do double these speeds but with huge difficulty and usually with a loss in part quality due to underextrusion.

 

So if you are printing 90mm/sec at 210C with .13mm layers, and .35mm line width, yes the printer can do this but with not much margin for error (like if there is a mild tangle or your bowden is getting old or many other minor annoyances that can push the printer into underextrusion territory.

 

The pattern I used in the picture posted was lines and you were correct about some types of infill (e.g. lines) print every other layer - I am now using grid which looks like lines, but prints the whole pattern on every layer. Lowering the speed to 60 mm/s also helped.

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