Heavy ripples behind supportstructures

[Giovanni V.]

Good morning!

My non-support prints are pretty good. Nice surface, close to perfect.
The problem only happens, when the print is shielded by the support structure.
I'll do some experiments with the z gap and the flow gain later this day.

Btw.: All the prints are 0.2mm layer height.

Lothar

Check the X Y offset between printer head #1 and #2.

[lme]

Check the X Y offset between printer head #1 and #2.

Sorry - Delta printer with only one head.

Lothar

[inventabuild]

Jonathan,

Please offer the option so the object goes down first, before the support. Doing this by "Extruder Ordering Optimization" set to "Fixed Order (most cooling)" is ok; perhaps a check box next to this setting so this feature can work either way in case some situations work better with different ordering.

The reason is, I have also noticed that the finish is not as nice when printing PLA w/ support and XY Gap = 0.7. I believe PLA likes a little more space to cool so putting the object down first will give it that extra space to cool down before it gets confined by support. Even with fans on, the finish is not as nice when printing with the supports, because it's hard to cool the PLA w/ the object printed so close to the support that was laid down first.

[inventabuild]

Jonathan, here are a couple of examples why I'd like to see support printed last. The first pic shows a print w/ KISSlicer and heavy ripples in the overhang in the frogs belly:

KISSlicer - Support Printed First

KISSlicer - Support Printed First.jpg (29.44 KiB) Viewed 2027 times

This second pic shows a print using Simplify3D which prints support last using the heirarchy Outline > Infill > Support. The ripples are almost non-existent using this approach:

Simplify3D - Support Printed Last

S3D - Support Printed Last.jpg (25.81 KiB) Viewed 2027 times

Both prints were done w/ the following specs:

Material: PLA
layer height: 0.2 mm
layer width: 0.4 mm
support xy offset: 0.75 mm
support z-gap: 0.22 mm
print speed 30 mm/sec
Fan: On @ Layer 3

All the other print variables should be the same between the two prints with the exception that KISSlicer prints support first and Simplify3D prints support last. Assuming the order in which support is printed is the deciding factor in the quality of the prints please implement printing the support last ASAP.