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pineirod

Dash lines on the top layer

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Posted · Dash lines on the top layer

Hi,

I'm still learning with the S5 printer.

 

Here two pictures of two parts (PCBs mockups); as one can see there are some dash lines on the top, even some smaller solid lines. 

 

Where do they come from?

 

I am using old PLA from a Prusa printer. The nozzle is 0.4AA, layer height 0.2 and I use the default speeds, temperature that Cura 3.6 proposes

 

Thanks

regards,

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Posted · Dash lines on the top layer

Hi

these lines are from travel moves over the skin.

You can configure the behavior with setting "Combing" to "not in skin", then when printing the skin, the head will avoid the skin areas.

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Posted · Dash lines on the top layer

Interesting as I have never used combing. Looking at your pic I suspect your retraction settings would benefit from a tune as a complementary or alternative option. I use 5.5mm for PLA/PHA and 6.5mm for  nGen. with a 0.4mm nozzle and running cool

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Posted · Dash lines on the top layer

Ok,

I will try these retraction options. I'm using pretty much the defaults from Cura, I understand they are optimized for the S5.

 

Honestly I'm a bit surprised about this, because it makes the printouts look ugly with the standard settings

 

cheers

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Posted · Dash lines on the top layer
31 minutes ago, pineirod said:

I'm using pretty much the defaults from Cura

Yes, and per default, combing is set to all.

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Posted · Dash lines on the top layer

I got some traces on the infill (picture attached); I didn't change the Combing option; is this from combing or maybe the nozzle is not well aligned? it seems to make a noise when traveling some times

 

thanks

 

2019-02-28 14.40.10.jpg

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Posted · Dash lines on the top layer

That's ok, traveling inside the infill area is without a retract, therefore you get some "noise" in the infill.

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Posted · Dash lines on the top layer

Shouldn't it be cleaner?

or if it doesn't retract it is faster?

 

Here another picture, there are many of these "loose threads" making a very bad looking result. Why is that?

 

 

 

 

2019-03-01 17.58.58.jpg

2019-03-01 17.59.04.jpg

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Posted · Dash lines on the top layer

This example is an extreme one, there are too many retractions and retractions are limited for a specific extrusion distance. The setting is called "Maximum Retraction Count" and you can try to increase it a little bit, but not too much. The limit is important that your filament will not grind down due to the extensive retractions.

 

The default setting is 25 for the UM3, so 25 retractions will happen, then it prints without retractions until the filament is moved enough to start over again with the retractions.

 

Such a model is hard to print, you have to play with retractions, combing and print temperature to avoid oozing when traveling without a retract. 

 

You can also check the setting "Max Comb Distance With No Retract", which defines the way the head can move without a retract.

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Posted · Dash lines on the top layer
3 hours ago, pineirod said:

or if it doesn't retract it is faster?

 

Forgot to answer this question: yes, retracting costs time and within the infill, it doesn't matter if there are some crumbles.

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