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BiaC

settings to avoid stepping

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Well, a curved face like that will always have steps since the printer lays out layers on top of each other. And since it is a dome it will not help to rotate it either. You will still have that stepping in the direction the layers are printed. The only thing you can do to improve the looks of the stepping is to lower the layer height to the lowest that your printer supports.

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If you cant get a smooth layer height then there is something wrong with the printer.

...except the steps are intentionally designed this way... @BiaC: do you have a picture (or the file itself) which shows how it should look like?

Hi. The model is a VERY smooth dome, no steps... Also other models are printed this steppy way, with same settings. And the printer runs smooth (changed also many nozzles, just to see whether they was the culprit). I printed perfectly so far until Cura 2.5, and using still .4 nozzle with layer height bigger than 0.06 (which is the height I'm using now...): then all got the tendency to come out worse that before, even using a 0.2 nozzle... It looks like in the latest versions they ruined a smooth app, by filling it with nags... (btw, I enabled retraction, but it looks like it doesn't work: perhaps it is my impression, but sometimes the nozzle whilst moving leaves a thin trail of plastic, which doesn't look to me like a sign of being enabled any retraction, or perhaps the app firmware isn't responding well...). And, I wouldn't say that's a problem of firmware: I choosed Prusa i3 in the printer list, 'cause the Geetech custom i3 mk8 wasn't listed... Though I wasn'ta ble to get any specific firmware for it, neither from Geetech nor from Cura's crew... Though I don't remember what I used previously, if Prusa i3 or a custom blank 200x200x200.

The problem surfaces also with other slicers, to whom I setted settings similar to Cura's: here's a screen of what I'm using currently:

5a33408ce2813_Senzatitolo-1.thumb.jpg.1fbc0489527680d550925b185e8a6256.jpg

5a33408d1639c_Senzatitolo-2.thumb.jpg.003d8f7d9ea13fb10728bb6fe8345154.jpg

Would you like to get the actual stl file and/or the gcode file, in order to scope/print them? I could provide them too. Just tell me how to add 'em here, or give me a mail (in pvt) to supply them to you.

Thanks.

Edited by Guest

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When i import objects i also usually have the scale crazy small. I have not had any issues regarding this. But regarding various versions of cura, the version i am currently using is also very buggy and decides to change a lot of settings on its own which is annoying. I would still be using the one that i first downloaded two years ago but i cant control the bottom layer which i usually set to a small amout. That version was rock solid.

...The most annoying feature about cura 2.1 is its bottom layer setting is that it not only affects the bottom layer that touches the buildplate but ALL bottom layers which i find a bit stupid because ot means by saving time printing fewer layers to start with your model will suffer if it has steep overhangs.

So.... in a nutshell....use what works best for you ignore new versions of anything unless you need them for a particular reason. Why upgrade if its worse? Surely that defeats the point of upgrading.

What was yor reason for upgrading cura if everything was ok before btw?

....but while im here, does anyone know if i can change te bottom thickness after say 5mm? Because if not, that feature would be very helpful and save a tone of time!!

Edited by Guest

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I have tried a print - this is a very small item indeed, when I open it in Cura  it is 4.21mm wide by 1.95mm high - so my question to you @BiaC is this the correct size ?

 

I forgot: please resize it as 42.5 mm to get the actual size. This seems to happen 'cause it was modeled in a poly based app, not into the parametric modeler which I usually use and which stands with the actual size.

Edited by Guest

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What was yor reason for upgrading cura if everything was ok before btw?

 

Do you know beforehand if an app will work as usual, or if it will fail? Do you have any prophetic abilities? As for me, I'll stand with the newer version always, and rather will try to adapt them to my needs, finetuning 'em, instead of backwarding. I already did thought to backgrade to some previous version: but the culprit isn't the version. It is something else.

Edited by Guest

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Hi. Sure, you're welcome. How can I share it? Here?

I don't think the forum supports file uploads so can you put it on some file sharing site (e.g. Dropbox) and post a link please?

 

I don't have it in any repository. I could send it via mail, as already I did with other users.

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I have just completed a print of this object, much easier after understanding from @BiaC that it had to be scaled by a factor of ten !

https://www.dropbox.com/s/95x8ht607h2i0p2/DSC_2096_2.jpg?dl=0

Looks OK to me, my parameters Print speed 40mm/s,infill 55mm/s, temp 210, layer height 0.10 nozzle 0.4

Edited by Guest

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I have just completed a print of this object, much easier after understanding from @BiaC that it had to be scaled by a factor of ten !

https://www.dropbox.com/s/95x8ht607h2i0p2/DSC_2096_2.jpg?dl=0

Looks OK to me, my parameters Print speed 40mm/s,infill 55mm/s, temp 210, layer height 0.10 nozzle 0.4

Thanks. Why then my prints aren't ok, not even at 0.06 layer height? (nay, they look all the same at any layer heights...)

Edited by Guest

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I think maybe it has to do with the way you change layer heights on a Prusa I3, which sorry I know very little about, or maybe the way Cura is set-up for your printer ?

you could try making the layer height bigger to see if that changes to an even worse print - at least you would see if it does change, you would only need to print a few layers not the whole object

are you sure that the file is being correctly written to the SDcard when you make changes to the layer height

Edited by Guest

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I think maybe it has to do with the way you change layer heights on a Prusa I3, which sorry I know very little about, or maybe the way Cura is set-up for your printer ?

you could try making the layer height bigger to see if that changes to an even worse print - at least you would see if it does change, you would only need to print a few layers not the whole object

are you sure that the file is being correctly written to the SDcard when you make changes to the layer height

The file is correctly written: unless the latest Cura makes some mistakes in writing it. Indeed, until Cura 2.5, I had no dire times in printing at high res: now, whatever settings I choose, I get what you saw.

I don't remember which prefab printer settings I choosed that time, but I guess anyway that I didn't chosed the Prusa i3, nor any of the other two Prusa flavors: if I choosed a simple custom one, with bulk 200x200x200 work area and 0.4 nozzle, well, now it isn't working anymore, 'cause I used it too, but I didn't got any progresses.

Though, which one should I set now? Possible that nobody has the code settings to use a Geetech i3 mk8? And possible that Cura's crew doesn't want to add the settings for a printer which is very widely used and should be meant as a "fork" of the original Prusa i3? I contacted them in order to ask them to add such settings, but I received from them the answer that it had had been ME the one who had to contact Geetech in order to get from them the piececodes of their printer! Go figure this!

Now I'm stuck with that and I've got many prototypes to print, but I cannot currently.

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hiya,

I am intrigued by this, clearly it shouldn't happen.

the only thing I can think of is massive over extrusion and it's building up the material by pushing it to form bigger steps.

this is assuming you have the correct printer setup in cura. if you are printing with PLA i'd lower the temp to 200 instead of 225.

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