How to improve layers that are printed on support?

[AmBev 0]

Hello, I would like some help with the printing of a gauntlet. It is being printed in PLA Tough and generating support with the material itself, however in the circular part that is shown in the images it is noticed that the part printed on the support looks bad, with aesthetically unpleasant finish.

The following parameters have already been changed in Cura, they are:
Printing temperature lowered by 10ºC;
The distance Z of the support in relation to the piece is 0.4 mm (maximum allowed by the slicer without impairing the impression) that same value is applied to the Top Distance and Bottom Distance;
Print speed tested at 50, 45, 40 and 35 mm/s; 30% support fill;
Support Interface activated with thickness equal to 1 mm, Interface Resolution of 0.4 mm, Interface Desnity of 100% and Pattern Zig Zag:
None of this had the desired effect, I am printing with only 1 extruder nozzle. What can I try to change to improve this print appearance?

 

printed part on the support (bad appearance):

 

 

 

good looking printing support:

[Guest maht]

When it comes to support material that's the same as your build material there's always going to be some scarring with removal.

 

Tough PLA can be post-processed, so you could try (wet)sanding the part after removing support material to improve surface quality. Alternatively if you have a dual-extrusion printer, you can use water-soluble support which dissolves away giving an untarnished surface.

 

Hope this gives some clues

[AmBev 0]

16 minutes ago, maht said:

When it comes to support material that's the same as your build material there's always going to be some scarring with removal.

 

Tough PLA can be post-processed, so you could try (wet)sanding the part after removing support material to improve surface quality. Alternatively if you have a dual-extrusion printer, you can use water-soluble support which dissolves away giving an untarnished surface.

 

Hope this gives some clues

Yes, thanks for the tips, I saw that with sandpaper and primer I can improve this acamaneto, I was hoping that with some parameter change I could solve the problem but as I said I tested several and I was unsuccessful.

[AndersK 59]

You can try and reduce distance between part and support roof. Go as close as you can without them fusing.

 

Printing with cooling? If not override fan speed for the first layer above support can help.

 

 

[AmBev 0]

On 1/20/2020 at 1:54 PM, AndersK said:

You can try and reduce distance between part and support roof. Go as close as you can without them fusing.

 

Printing with cooling? If not override fan speed for the first layer above support can help.

 

 

Yes I printing with cooling. I will test this option, thanks!!

[sajawors 0]

Let us know if that worked! I actually came back to ask the exact same question!

 

I have a print job that we only used another printer for b/c it was the object is too big for the ultimaker. That printer has since died, so i have to try and make it work on the ultimaker, which means printing it on its side. It's U shaped, so the entire inside of one side of the U is going to be scarred after printing, and I really don't want that. It's a 25 hour print job, so I'd like to get it right on the first pass if possible. 

[geert_2 557]

2 hours ago, sajawors said:

...

It's a 25 hour print job, so I'd like to get it right on the first pass if possible. 

 

Maybe you could try cutting out critical parts or features from the design, and assemble them in a small test piece? Then try printing this until you get it optimised.