Unresolved Ghosting and overhangs.

Hi guys. I've been seeing a lot of ghosting on my prints.

I'm printing with PLA at 195C and the bed at 50C at 40mm/s. I have lowered the acceleration considerably in the config file for the printer based on the advise in a previous thread. I think it was maybe 800 to begin with and I lowered it to 300 but it was a few months ago so I don't remember exactly what it's baseline value was. I've also tightened the belt.

You can see an example of what I mean in the print below.

I've also noticed that my printer can't do overhangs. Full stop can't do them no matter how shallow the angle. You can see that's pretty evident in the images below too. Does anyone have any advice on printing overhangs without the effect you can see around the bottom of the print? I have dual cooling fans that are on 100% after the first few layers.

 

Simplify3D.

You can sort of see in the image that on every diamond, the upper two angles have the same issue. I couldn't have used supports on the whole things since it wouldn't be reasonable for cleanup. I saw all the images on Thingiverse of other prints and I didn't notice any having the same issue as me (plenty had other issues though).

 

I know the supports are easy to remove, but when there's 200 of them I don't fancy it.

Extruder calibration gets suggested every time anybody posts a print quality issue. I've tried it 4 times. Every time I get the same answer for steps (881) and when I put it in, it doesn't work nearly as well as the default 723. It overextrudes like crazy.

I appreciate the ideas though!

 

The first image is at 100 microns and the second is at 50. There aren't too many differences the layer height made to the ghosting. You can see it happens across the entire face of the cube. I wonder if it's a vibration within the x axis stepper motor? I included the exact gcode files that printed those cubes.

 

Oh really? Sorry. It's just the standard calibration cube. Here's the stl.

 

I hadn't noticed the corners but if they can be better then that's great!

Do you think a minute bounce in the x-axis belt could cause the rippling effect you can see in the image? Would another material be better? I could also swap out the x axis stepper motor for a spare motor I have.

Thanks very much for the time you're taking to help me improve my prints!

 

I only use a raft because my printer bed seems to have some sort of tectonic activity going on where it magically changes height periodically. I don't like them either.

From what I can see from your picture, the little waves are not present on your print. Here is a far better example of what I'm experiencing. I printed this a little while ago at 100 microns.

Do you think vibration of the x axis stepper motor or some other source of vibration could be the cause? I'm drawing a bit of a blank on it.

 

Definitely appears to be a sort of constant resonance as it is perfectly regular. It doesn't elongate towards the end of a line or anything which would indicate acceleration isn't affecting it.

 

The 50 micron cube was printed at 1500mm/min. The 100 micron cube was the same. The vase was printed at 2400mm/min. I have an E3D v6 with a 0.25mm nozzle.

I don't tend to paint my prints since they're generally just for mockups anyway. It's just nice to have things look good if you're presenting them to somebody.