It appears the corner ringing issue I have is not due to speed but

3D Printing
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1

It appears the corner ringing issue I have is not due to speed but due to the number of outer shell. Bumping the number of shell from 3 to 4 alleviates the vertical ringing effects caused by infill showing through and the corner ringing.

I still have the bottom layer caving despite running the bed only at 60 degree. Pid are tuned for both extruder and bed. What else can I do to improve on these situations? I am now rotating the print 45 degree so the infill is parallel with the surface.

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8c60566c915b66f30ff2f2827f10a9f2.jpeg4160×3120 1.86 MB

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5da70f85b7fa089b0d7ffe7b962e63f1.jpeg4160×3120 2.15 MB

2

Increase? Wouldn’t that cause more issues?

3

If you mean your bottom layer is detaching from bed surface, then you may check : is there air moving around? fan for electronics running? at 60° you don’t have this, but you may try to use 4~6 mm brim around the solid (check the option in you slicer software); for corners, you may try to not use ‘infill before perimeters’, and check how much extrusion you have during extrusion, it it is too much, the you have an excessing deposit of plastic going toward and backward; this is what in my mind, but don’t trust me too much, I’m not in experience so much…

4

is your filament diameter setting correct?
is it ABS or PLA?

5

I have the exact same problem…

6

It’s pla. First layer has no fan, 20 mm/s, acceleration is 1500. Normal perimeter speed is 20. Other speed is 30.

7

I struggled with this problem for many month on a Reprap that I built. I thought the problem was caused by cooler air around the open Reprap printer. I tried using heat lamps to keep the area warm with no success.

In October 2014 I purchased a FlashForge Dreamer. It is an enclosed print bed. I thought the purpose of the closed print bed would be to keep the air around the print warm.

I was wrong. The Dreamer has two 3 inch fans mounted on the back and the fans run constantly during printing.
There is also a fan on the dual print head (in addition to the 2 extruder fans) that has a duct that cools the molten filament after it is extruded.

I think the culprit here is uneven cooling of the air around the print. The two fans at the back of the dreamed provide an even consistent cooling of the enclosure.

This is just my theory and I am sure there are other variables that come into play. Maybe you have a better explanation.