How to make Prusa Slicer work

A Former User

@the_dragonlord Here's what happens:

achrn

@the_dragonlord said in How to make Prusa Slicer work:

They are completely different from each other.....

They aren't expected to be the same.

Also, I note your Prusa example has a skirt, apparently with curves at the corners, so that muddies the waters. There's also reference to pressure advance in teh code, but I don't think that's more than a red herring.

Your ideamaker cube has this:

G0 F9000 X155.292 Y155.292
;TYPE:WALL-OUTER
;WIDTH:0.585
...
G1 F2400 X164.708 Y155.292 E0.6321
G1 X164.708 Y164.708 E0.6321
G1 X155.292 Y164.708 E0.6321
G1 X155.292 Y155.292 E0.6321

So that is simple squares, the nozzle moving 9.416mm to a side and using 0.6321mm of filament. That's 0.161mm2 extrusion.

The Prusaslicer cube has this

G1 X160.200 Y169.800
;TYPE:External perimeter
;WIDTH:0.4
...
G1 X160.200 Y160.200 E0.28504
G1 X169.800 Y160.200 E0.28504
...
G1 X169.800 Y169.800 E0.28504
G1 X160.260 Y169.800 E0.28325

So that is simple square, the nozzle moving 9.600mm to a side and using 0.28504mm of filament. That's only 0.072mm2 extrusion

The comments say the Prusa is a thinner wall, but only 10% thinner. Pro-rata both to 0.45 thick would bring the Prusa up to 0.0805mm2.

So the Prusa is delivering half as much filament (curiously, exactly half as much) for some reason. However, I'm suspicious that the Prusa is delivering what it should - a 0.4 x 0.2 mm extrusion should be 0.4x0.2=0.08mm2. Have you, long ago, put some correction factor into the other slicers for some reason?

With a factor of exactly two I'd start to wonder if a 400 step stepper was swapped for a 200, and 'fixed' by putting an extrusion multiplier in? As per previous poster's suggestion, I'd go back and check calibration and configuration of the extrusion hardware from fresh, but you didn't like that suggestion.

achrn

@achrn said in How to make Prusa Slicer work:

G0 F9000 X155.292 Y155.292
;TYPE:WALL-OUTER
;WIDTH:0.585
...
G1 F2400 X164.708 Y155.292 E0.6321
G1 X164.708 Y164.708 E0.6321
G1 X155.292 Y164.708 E0.6321
G1 X155.292 Y155.292 E0.6321
So that is simple squares, the nozzle moving 9.416mm to a side and using 0.6321mm of filament. That's 0.161mm2 extrusion.

Aha, but I've just noticed that further down it has

0 F900 Z0.500
G0 F9000 X155.225 Y155.225
;TYPE:WALL-OUTER
;WIDTH:0.450
G1 F600 X164.775 Y155.225 E0.3288
G1 X164.775 Y164.775 E0.3288
G1 X155.225 Y164.775 E0.3288
G1 X155.225 Y155.225 E0.3288

Which is much closer to the Prusa case. I don't jknow what that slicer is doing there. I still think teh GCode from Prusa is calling for about teh right amount of material.

A Former User

@achrn said in How to make Prusa Slicer work:

@the_dragonlord said in How to make Prusa Slicer work:

They are completely different from each other.....

They aren't expected to be the same.

Also, I note your Prusa example has a skirt, apparently with curves at the corners, so that muddies the waters. There's also reference to pressure advance in teh code, but I don't think that's more than a red herring.

Your ideamaker cube has this:
G0 F9000 X155.292 Y155.292
;TYPE:WALL-OUTER
;WIDTH:0.585
...
G1 F2400 X164.708 Y155.292 E0.6321
G1 X164.708 Y164.708 E0.6321
G1 X155.292 Y164.708 E0.6321
G1 X155.292 Y155.292 E0.6321
So that is simple squares, the nozzle moving 9.416mm to a side and using 0.6321mm of filament. That's 0.161mm2 extrusion.

The Prusaslicer cube has this
G1 X160.200 Y169.800
;TYPE:External perimeter
;WIDTH:0.4
...
G1 X160.200 Y160.200 E0.28504
G1 X169.800 Y160.200 E0.28504
...
G1 X169.800 Y169.800 E0.28504
G1 X160.260 Y169.800 E0.28325
So that is simple square, the nozzle moving 9.600mm to a side and using 0.28504mm of filament. That's only 0.072mm2 extrusion

The comments say the Prusa is a thinner wall, but only 10% thinner. Pro-rata both to 0.45 thick would bring the Prusa up to 0.0805mm2.

So the Prusa is delivering half as much filament (curiously, exactly half as much) for some reason. However, I'm suspicious that the Prusa is delivering what it should - a 0.4 x 0.2 mm extrusion should be 0.4x0.2=0.08mm2. Have you, long ago, put some correction factor into the other slicers for some reason?

With a factor of exactly two I'd start to wonder if a 400 step stepper was swapped for a 200, and 'fixed' by putting an extrusion multiplier in? As per previous poster's suggestion, I'd go back and check calibration and configuration of the extrusion hardware from fresh, but you didn't like that suggestion.

Thanks for your answer, in Ideamaker I haven't made any adjustment on the stepper steps/mm or some kind of multiplier...It not I didn't liked the suggestion, it's that they are all steps that I've made right now and I'm sure that in Ideamaker I have no firmware overrides about step/mm or so on...I've just made several thin wall tests to get the exact extrusion multiplier for all my filaments....I really don't know what's happening....even with Simplify3D it all gone well...only with PS there are problems...

gloomyandy

@the_dragonlord How did you tune your extruder steps/mm set in config.g? If it involved something that used your slicer you may have in effect tuned for that. What value do you have set for steps/mm in your config.g file and what extruder are you using?

A Former User

@gloomyandy said in How to make Prusa Slicer work:

@the_dragonlord How did you tune your extruder steps/mm set in config.g? If it involved something that used your slicer you may have in effect tuned for that. What value do you have set for steps/mm in your config.g file and what extruder are you using?

415 step/mm, original bondtech BMG

gloomyandy

@the_dragonlord Assuming that has a standard 1.8 degree stepper (does it?), that sounds fine.

A Former User

@gloomyandy said in How to make Prusa Slicer work:

@the_dragonlord Assuming that has a standard 1.8 degree stepper (does it?), that sounds fine.

it sound because it is fine with other slicers I have no problems

Phaedrux

Is the first layer height the same? Same width and flow rate?

engikeneer

@the_dragonlord I've used PS for years with issues so am slightly perplexed by your issue!

One thought - are the filament/printer/print profiles that you're editing the ones that PS is using to slice the file? I.E. Do these:

Match these:

Could simply be that you're actualy slicing with one of the default 2.85mm profiles?

Failing that, if you can export your config from PS (File, Export, Export config), post it here and I can try it on mine to see what's up. Might need to rename the filetype to .txt to upload it to the forum

A Former User

@phaedrux said in How to make Prusa Slicer work:

Is the first layer height the same? Same width and flow rate?

yes

A Former User

@engikeneer said in How to make Prusa Slicer work:

@the_dragonlord I've used PS for years with issues so am slightly perplexed by your issue!

One thought - are the filament/printer/print profiles that you're editing the ones that PS is using to slice the file? I.E. Do these:

Match these:

Could simply be that you're actualy slicing with one of the default 2.85mm profiles?

Failing that, if you can export your config from PS (File, Export, Export config), post it here and I can try it on mine to see what's up. Might need to rename the filetype to .txt to upload it to the forum

no, it's not my case, the profiles, unfortunately, are correct. Here's my config fileconfig.ini.txt

Thanks!

engikeneer

@the_dragonlord I think I've found some of your issue. Your first layer extrusion width is set to 120%, so over a 0.24mm first layer height, you only get 0.288mm width lines for your first layer. Personally, I set all these as widths in mm so I know what I'm getting even if I change the layer height.

You can see this if you look at the sliced line widths on the plater. Looks like the brim and infil are affected, but the external perimeter is slicing at 0.4mm which you specified.

The other thing I noticed is that you are using absolute extrusion. General advice is to use relative extrusion because you may lose accuracy in long prints. Note that you've got M92 in your custom start code there too!

A Former User

@engikeneer said in How to make Prusa Slicer work:

@the_dragonlord I think I've found some of your issue. Your first layer extrusion width is set to 120%, so over a 0.24mm first layer height, you only get 0.288mm width lines for your first layer. Personally, I set all these as widths in mm so I know what I'm getting even if I change the layer height.

You can see this if you look at the sliced line widths on the plater. Looks like the brim and infil are affected, but the external perimeter is slicing at 0.4mm which you specified.

The other thing I noticed is that you are using absolute extrusion. General advice is to use relative extrusion because you may lose accuracy in long prints. Note that you've got M92 in your custom start code there too!

excellent, thanks! i'll try your suggestions when I'll return home! what is your setting for the first layer extrusion width?

achrn

@engikeneer said in How to make Prusa Slicer work:

The other thing I noticed is that you are using absolute extrusion. General advice is to use relative extrusion because you may lose accuracy in long prints. Note that you've got M92 in your custom start code there too!

I thought that, and I would have sworn that's what at least one of the files extracts showed the first time I looked at them, but it's not what they show the second time I looked (and now). This is clearly not absolute extrusion:

;LAYER_CHANGE
;Z:0.44
;HEIGHT:0.2
M98 P"Print_gcodes/pressure_advance_at_layer_change.g"
G1 Z0.440 F7200.000
G10 S205 ; set temperature
G1 X160.200 Y169.800
;TYPE:External perimeter
;WIDTH:0.4
G1 F900.000
G1 X160.200 Y160.200 E0.28504
G1 X169.800 Y160.200 E0.28504
M73 P15 R2
G1 X169.800 Y169.800 E0.28504
G1 X160.260 Y169.800 E0.28325
G1 E-3.00000 F2400.000

otherwise there's no extrusion on two of those sides, and retraction on the fourth.

So now I'm wondering if the forum is occasionally showing a differnet file to reasders!

engikeneer

@the_dragonlord I think 0.45mm for a 0.35mm nozzle, but I'm not 100% sure as I'm out today. Typically I'd do nozzle width +30-40% for first layer but I've never really played too much attention to it tbh...

Also @achrn makes a good point. In your first post you had relative extrusion selected but had an M82 in you custom start code which may have overridden things and caused your issue.

Edit: back home now and here are the setting I used to use for my 0.4mm nozzle (though I've been using a 0.35mm for a while now). They work okay for me, but not done any calibration etc - main thing is that the support material is less than nozzle dia so that it is weaker, all the others are larger