Vertical lines,  

Re: Vertical lines,

I'm no expert, but that might be the phenomenon called "ringing", or maybe "z-wobble".

Check out Simplify 3D's print quality troubleshooting page:
https://www.simplify3d.com/support/print-quality-troubleshooting/

Specifically the sections "Vibrations and Ringing" and maybe "Lines on the Side of Print".

Other useful guides:
https://all3dp.com/1/common-3d-printing-problems-troubleshooting-3d-printer-issues/
https://www.matterhackers.com/articles/3d-printer-troubleshooting-guide
http://support.3dverkstan.se/article/23-a-visual-ultimaker-troubleshooting-guide
http://www.geeetech.com/blog/2016/12/troubleshooting-guide-to-19-common-3d-printing-problemspart-one/
http://www.afinibot3dprinter.com/article/16common3dprintingproble.html

I hope that helps.

Re: Vertical lines,

Seems that all 3D printers will do this to some extent. When I was searching for information on this subject I found the Polymaker Polysher was made just for this issue.
Someone is making money off of what you are observing already.

Re: Vertical lines,

In not talking about the print lines, I'm talking about the vertical lines that ou can se perpendicular to the print line. And it is not the ghosting I'm talking about even though thats present to. these vertical lines are all around the model.

Re: Vertical lines,

In not talking about the print lines, I'm talking about the vertical lines that ou can se perpendicular to the print line. And it is not the ghosting I'm talking about even though thats present to. these vertical lines are all around the model.

That definitely looks like ringing to me.

What's happening is that when the print head makes a sudden change in direction, it vibrates a little rather than tracking perfectly to the desired path. You can see that the lines appear largest close to Marvin's ears (where there's a sharp corner), and get smaller further away.

Slowing down your print speed will reduce ringing. Others with more expertise than I may know of other settings you can tweak.

Re: Vertical lines,

but they are all over the model look at his back. ringing /ghosting disappear but these are consistent

Re: Vertical lines,

I got the same thing on my Marvin as well. Back has vertical rings all along it. A little bit on the front as well.

Just from hanging out on /r/3dprinting for a while, I know that loose belts can cause ringing. Especially when going around corners. But my belts are already pretty tight. They make the sound of a guitar string when you pluck them. I guess I could go tighter... but I dunno if that would fix the ringing or not.

Here's a video of the ringing:

I'm pretty satisfied with the print otherwise. Maybe the printer is vibrating too much? It does hit some pretty strong vibration frequencies, occasionally.

Re: Vertical lines,

There's an easy test: try printing the same model at half speed. If it's ringing, then it should get substantially better. If there's little or no change then it's something other than ringing.

Re: Vertical lines,

Just a thought, how is the digital model tessellated? This might just be normal faceting -- others with more 3D printing experience can chime in, but I've found myself pushing poly count when generating STLs due to this.

Re: Vertical lines,

There's an easy test: try printing the same model at half speed. If it's ringing, then it should get substantially better. If there's little or no change then it's something other than ringing.

Thanks for the advice!

I did a test as you said.

Left is printed at 50 speed. Right is printed at 100 speed. Pretty big difference in ringing, IMO. I really wish there was a way to improve it, other than lowering the print speed.

Re: Vertical lines,

If tightening the belts should make it better, loosening the belts should make it worse. You could try that, to verify that belt tension is the/a problem.

You could also try rotating the model 90 degrees. See if the Y-axis has the same problem.

Re: Vertical lines,

Left is printed at 50 speed. Right is printed at 100 speed. Pretty big difference in ringing, IMO. I really wish there was a way to improve it, other than lowering the print speed.

There may be settings you can tweak to reduce the ringing, but in general there's always going to be a tradeoff between speed and quality. The faster the mechanical parts move, the harder it is to keep them on the exact toolpath. With a shiny filament even very small defects can be very visible.

If there's any consolation, I've found that other people often don't notice defects that look glaringly obvious to me.

Re: Vertical lines,

You may as well just drop acceleration or jerk settings - why slow down everything when it's just the corners giving you issues?

Lightening the carriage could help, too.