Hi all,
I wonder if anyone can help me with an issue I’m having?
I’m trying to print the below lampshade in Vase mode at 0.20 layer height / strength profile and I’m having issues with the bottom/top layer separating from the actual main body of the print.
https://www.thingiverse.com/thing:2744467
I can see that the area that separates shows up as Gap Infill in the slicer. This is shown in white on the left and right sides of the screenshot below.
I’d appreciate any input anyone can give me in fixing this because other than that the print came out great.
Cheers
Rob
I am not an expert in vase mode. I can add more information for you though.
Even though you are in vase mode, you are printing 3 bottom layers. The white line and the white dots are where the infill for the bottom doesn’t quite meet the circular perimeter of the bottom (or in this case the third layer.
Here is a zoomed image at a higher layer.
What you see where the red meets the orange is the infill of the third layer. That orange is a complete perimeter. Then you can see where the vase mode starts and moves counter clockwise around the body, and how as it finishes the first vase mode circle it rises and continues.
I used 1 to make sure I was looking straight down from the top of the model. That allows you to see that each time around the line is moving farther from the center of the print. So in vase mode the extrusion is only partly overlapping the extrusion below it. The start of vase mode does not look like it overlaps the 3rd layer perimeter as much as the second vase mode overlaps the first.
When I change the outer wall width to .6mm, you can see the start of the vase mode there is not great overlap.
However, the following passes in vase mode have great overlap.
When I change all the line width settings to .6 I get the best result. The overhang on the outside is based on the slope of the model. With wider lines the overhang stays the same but the overlap of the extrude is larger.
But the very beginning of vase mode still has less overlap. Even when I tried with one bottom layer it has the same start characteristic.
I have a possible solution. Change to a single layer for the bottom and set the bottom pattern to concentric. The vase mode starts as the outer wall of the bottom layer.
Use line width as above to control the strength of the vase.
Slow your print speed for better adhesion and possibly run the nozzle hotter. (I up my normal PLA temp by about 20C when I need strong layer adhesion for a thin walled part.)
I hope some of this helps. Sorry that I couldn’t give you a definitive answer.
1 Like
Thank you for going into such detail!
All very useful to know and I can see that by changing bottom shell layers to 1 the artefacts pretty much disappear. I think the reason it was set to 3 was that because this is a lampshade, the bottom layer with the 29mm hole has to support the rest of the structure, so I guess it needs some reasonable strength, hopefully changing the line width will help with that.
I might try a partial print and see what the strength is like, but you’ve definitely given me some food for thought
Cheers
Rob
