Blobs in Vase Mode

[MasterFX]

If I remember I will try.
Do you see any differences in the actual hardware setup between S3D and Cura? Just a thought.

Nope it is all the same. I mean I don't have any problems with "normal" prints. I have very decent prints with my anet a8, they are as good as the one of my CTC which I used for about 4 years. Even 120mm/s is no problem with the anet a8 and it still has a good quality with that speed. But in Vase Mode especially with transparent filament I see those problems.

And by the way, I only print via SD-Card not via USB.

[MasterFX]

I just found a difference in the gcode.
Cura:

Code: Select all

;TIME_ELAPSED:317.070556
;LAYER:27
;TYPE:WALL-OUTER
G1 F1151 X110.092 Y105.17 Z8.401 E482.98994
G1 X109.993 Y104.051 Z8.404 E483.05956
G1 X110.236 Y100.819 Z8.414 E483.26043
G1 X110.398 Y99.916 Z8.417 E483.31729

S3D:

Code: Select all

; layer 29, Z = 8.7
; outer perimeter
G1 X102.234 Y97.172 Z8.400 E518.1212 F900
G1 X102.964 Y96.577 Z8.410 E518.1920
G1 X105.057 Y95.489 Z8.413 E518.3695
G1 X106.514 Y94.849 Z8.420 E518.4892
G1 X107.146 Y94.625 Z8.425 E518.5397
G1 X107.320 Y94.691 Z8.427 E518.5537

You see that too? S3D seems to use only 4 decimal places on the Extrusion Axis, where Cura uses 5. Could this be the reason for the blobs? So maybe S3D is rounding to much and then we get some time a little bit too much filament out because of rounding errors

I know that the printer only has an extruder resolution of 95 steps/mm (so 0.01mm per step) but maybe the firmware rounds better (for the print) than the Slicer. Just an idea...

[wirlybird]

I am going to try printing today. Is PLA ok? Anything I need to watch for to keep the test accurate?

[MasterFX]

I printed with PLA.
-Vase Mode
-Layer Height: 0.3mm
-Top Layers: 0
-Bottom-Layers: 4
-Extrusion Multiplayer: 1.2
-Printing Speed: 30mm/s
-Outline Underspeed: 50%
Cooling => Adjust printing speed for layer below: unchecked

[wirlybird]

Here is my attempt.
Vase mode S3D in PLA
.2 layer
1 on multiplier for this printer but usually .9 for PLA is a standard starting point.

[MasterFX]

Here is my attempt.
Vase mode S3D in PLA
.2 layer
1 on multiplier for this printer but usually .9 for PLA is a standard starting point.

20170701_113103.jpg

Okay. As far as I can see on the blurred image may See blobs. Of cause you have much different settings. I use 1.2 extrusion multiplier to get it waterproof (especially the bottom) and a little bit more rigit

[wirlybird]

Image is not blurred, the background is because it is a closeup and I had to reduce the file size so much to get it to upload.
Here is another shot in a lower resolution so I didn't have to reduce the file as much to get it to upload.There are NO blobs at all.

1.2 for an extrusion multiplier is very excessive especially for PLA.

[MasterFX]

Ok I found the Blobs... they are already in the generated G-Code. Seems like S3D is doing something wrong.
Here are the z-cross section views:
Before Slicing

After Slicing

And a cut a little bit higher

These are exactly the blobs I see on the printed model. Repair Checks of S3D doesn't show any problems

[wirlybird]

Interesting, I'll pull it up again and see if I see the same thing.

[MasterFX]

And guess what... Cura doesn't do that
Side by Side same position