KISSlicer 1.6 Beta Bug Reports

[pjr]

Humm

Could be too much preload; could also be under-extrusion due to over-retraction. Or insufficient filament feed.

Too much preload...

Peter

[inventabuild]

I used the PreloadVE Wizard to print this part. The blue area printed clean and the read area printed with chatter. I used the point in the blue area right up to, but before the point in the read area to calculate the PreloadVE coefficient:

Thus I used 8 mm for Best Z and the Wizard gave me a PreloadVE calculated value of 0.4:

Here's the result. In the curved part of a heart with PreloadVE of 0.4 I get under-extrusion at the seam:

I'm seeing similar results from other people that use the PreloadVE Tuning Wizard. I could choose a Best Z of 4 mm which is right in the middle of the blue area in the picture above and get better results and I could keep iterating this till it looks just right for this particular part, but I would like to cut to the chase because I have a lot of jobs I need to print. Am I doing something wrong? Has anyone heard directly from Jonathan on the best way to pick Best Z for his Wizard's calculations?

Update: I'm going to try printing with Best Z = 4 mm (middle of the blue area) which gives me a PreloadVE = 0.2 and then try printing w/ the Experimentally Calculated PreloadVE = 0.131892 and see which gives me best results...

Update 2: The heart is a dual extrusion part and I just found out using Best Z = 8 mm clogged one of my extruders so I know using a point right up to the border of the chatter is not right.

[abuharsky]

Perhaps check your extruder to make sure the drive gear is firmly secured and clean (no plastic residue) and tensioned properly.

1) Don't worry about cracks on right part, this is because I'm using ABS at low temp (used at 230C, but on 245-255C no cracks at all).
2) Extruder gear is ok and tightened, it is clean on start, but, sometimes it "eat" some filament. This is happens only with new kisslicer with preload feature. With all other slicers, used with same filament, same hardware ans same slicing settings this is not happening.

Looks like new kisslicer makes some over-retraction at high speed(15mm/s very high for 3mm filament and 0.4 nozzle), that happen extruder to grind filament.

[StrannikZet]

Perhaps check your extruder to make sure the drive gear is firmly secured and clean (no plastic residue) and tensioned properly.

1) Don't worry about cracks on right part, this is because I'm using ABS at low temp (used at 230C, but on 245-255C no cracks at all).
2) Extruder gear is ok and tightened, it is clean on start, but, sometimes it "eat" some filament. This is happens only with new kisslicer with preload feature. With all other slicers, used with same filament, same hardware ans same slicing settings this is not happening.

Looks like new kisslicer makes some over-retraction at high speed(15mm/s very high for 3mm filament and 0.4 nozzle), that happen extruder to grind filament.

For testing, I think it's better to put a gcode from a kisslicer and another slicer.

[inventabuild]

That's a good idea. I test Released 1.5 vs Beta 1.6 when I see issues.

[abuharsky]

Perhaps check your extruder to make sure the drive gear is firmly secured and clean (no plastic residue) and tensioned properly.

1) Don't worry about cracks on right part, this is because I'm using ABS at low temp (used at 230C, but on 245-255C no cracks at all).
2) Extruder gear is ok and tightened, it is clean on start, but, sometimes it "eat" some filament. This is happens only with new kisslicer with preload feature. With all other slicers, used with same filament, same hardware ans same slicing settings this is not happening.

Looks like new kisslicer makes some over-retraction at high speed(15mm/s very high for 3mm filament and 0.4 nozzle), that happen extruder to grind filament.

For testing, I think it's better to put a gcode from a kisslicer and another slicer.

So,

Kisslicer 1.5 - good print (some strings between supports, but good walls)

3.jpg (72.88 KiB) Viewed 3540 times

Kisslicer 1.6(2.4)
bad top part

2.jpg (66.58 KiB) Viewed 3540 times

Model and gcodes from 1.5 and 1.6 attached; setting are similar

[abuharsky]

I think that problem solved:
preload ve was calibrated at 255C, but then I changed extruder temp to 230C. So, different temps needs different preload values.

[inventabuild]

Humm

Could be too much preload; could also be under-extrusion due to over-retraction. Or insufficient filament feed.

IMG_20170719_001159.jpg

Peter

Hi Peter, I notice black streaks in your lavender / pink tuning part. Is that remnants of another color in your Prusa 4 color multi material add on? I was hoping it was possible to completely purge the old color before starting to print with a new color; hence the reason for my question.

[pjr]

Hi Peter, I notice black streaks in your lavender / pink tuning part. Is that remnants of another color in your Prusa 4 color multi material add on? I was hoping it was possible to completely purge the old color before starting to print with a new color; hence the reason for my question.

No that is pencil markings I made when I was looking at the model.

Peter

[K.Miya]

When I switched to Beta 2.4 for Mac, "selected-profiles and used-RAM are displayed left and right reversely.