Problems with consistent printing

[elmsi89 0]

Hi,

Sometimes, I have problems with consistent printing. Please look at the pictures in my gallery: http://umforum.ultimaker.com/index.php?/gallery/image/8224-p8226609/

(I don't know how I can link them in the post. The forum technique is a bit weird ...)

At a certain height, I get with different materials* often, but not everytime, strange printing errors. I have experienced something similar beforehand, where I changed the overall wall thickness. (e.g. from 2 mm to 1,5 mm) But now, I don't know why this occurs. I've checked the CAD file and there is nothing. This also counts for the G-Code (but I will show you the Code happily tomorrow).

The problem is, I want to use the model afterwards with some force, but you can see in one of the three pics, that one model is ripped right through the problematic area. It happend the moment, I wanted to take it from the buildplate.

Do you know what this is and how I can get rid of it?

* ø1,75 mm PLA (don't know witch manufactor)) and ø2,85 mm colorfabb sky blue

Best Wishes

gr5 edit - added below images:

 

[targeter 15]

To me it looks like a problem with your z stage.

Have you lubricated the trapez rod all the way?

 

[gr5 2,172]

To add your images start a post and click "my media" next to smile icon.

So this is happening on 2 different printers? Both sliced with Cura? The Z stage issue doesn't make sense if it is 2 different printers.

Did you look at this area in "layer view" in Cura? Sometimes this helps explain a lot of things.

 

[elmsi89 0]

To me it looks like a problem with your z stage.

Have you lubricated the trapez rod all the way?

 

No, I didn't do that, but to be honest: I also didn't look to closly at the rod.

How can the lubrication affect the print quality sometimes and sometimes not? (note: I've printed the file a couple of times and sometimes the problem occurs and sometimes not.)

 

To add your images start a post and click "my media" next to smile icon.

So this is happening on 2 different printers? Both sliced with Cura? The Z stage issue doesn't make sense if it is 2 different printers.

Did you look at this area in "layer view" in Cura? Sometimes this helps explain a lot of things.

 

thanks for explaining that. I haven't found it. :/ mea culpa.

to the 2nd: no, only with one printer, but with two different materials. (yes, I looked into the layers, but didn't find anything exceptional.)

 

[gr5 2,172]

but with two different materials

 

You said one of the filaments was 1.75mm and one with 3mm filament. So can the leapfrog print with both of those on the same printer? You are really confusing me more and more.

It looks like underextrusion but underextrusion can be caused if the Z stage moves down farther than it's supposed to because you have not enough material to fill the gap. Or it can be that the filament tangles or all kinds of things - about 10 possible things (isolator compressed, filament too tight for bowden, feeder gear plugged with filament particles, filament entering feeder at an angle, clog in nozzle, temp probe faulty so nozzle too cold, tangled filament, feeder sprint too loose or tight, current to stepper to weak, stepper driver too hot, feeder worn down and rubbing against bearing, feeder particles inside nozzle, printing too fast, printing too cold). If this is on a UM2 you can do a test here:

http://umforum.ultimaker.com/index.php?/topic/4586-can-your-um2-printer-achieve-10mm3s-test-it-here/