Layer delimitation issue

[Kris]

I've borrowed a Qidi tech x-pro printer to play with for a few days. Having completed a couple of prints I am having some delimitation issues. I have tried upping the print temperature but this does not seem to have solved the issue. Any suggestions?

 

 

Edited February 16, 2020 by Kris
Larger images inserted

[JimFin]

Generally - wherever you are printing is too cold. Point is made on a few 3D print forums, this gives a good description -

 

Cool environmental conditions are the single biggest contributor to delamination. Delamination or edge/corner cracking is caused by warping stresses when the first layer adhesion is stronger than the interlayer bonding. Or it happens when the heated build plate allows a strong non-warping foundation to be built until the print is too tall to be adequately warmed by the plate. In either case, the corners of the first layer can't lift, so the print cracks elsewhere to relieve the stress.

 

Other possible issues are under extrusion which could be a sticky / jamming spool or the feed mechanism needing a service.

[Kris]

It's not in the warmest of rooms, but it is also not in the coldest either, however it may be in a draft. 

 

I wonder if it would help to increase the build plate temperature. 

[ElTristan]

Kris, I really want to see those structures print well -- looks amazing!  I'm not familiar with the Qidi tech x-pro you're using, but is it enclosed already?  You may still want to try putting a large carton over the whole shebang to insulate it thermally and to stop drafts while printing.  I'd guess your build plate is warm enough because the lowermost layers aren't delaminating -- make sure the plate heater isn't turning off?  Failing all that, breaking the model into smaller chunks for printing sometimes helps.  gl!

[AdamsRadial]

Also lower the setting for the part-cooling fan, this often has a greater effect than the bed temperature, especially as you get up higher on the build.

[JimFin]

Any way to put a hood over it? I have a clear plastic storage box I use as a hood on the top of my Ultimaker and cover the front aperture when I am printing with ABS which is particularly heat sensitive.

[Kris]

It is already enclosed in it's own case.

[Kris]

This is the printer. 

 

I'm assuming that the case on it is adequate. The ABS feed is detached but not in use.

[JimFin]

Looks good, only other thought - is the heated bed working and at the right temperature - about 60 for PLA

[Kris]

The bed appears warm to touch after the printing has completed so I guess that it is working. I have set it to 60 but without checking this with a temperature probe I don't actually know if it is reaching the correct level. 

[letterspider]

My printer is an Ultimaker clone and for PLA printing onto a raft I ghet good results when I warm the bed to 85'C

I have left some advice on your (other) viaduct thread

 

 

[unravelled]

I'm just starting with an Aldi printer and I had some similar problems. One reason I found given on a website was absorbed waterin the  fibre, suggesting it should be stored in a dehumidifier, if the printer is normally in a humid area.

 

Hth

 

Dave

[Kris]

1 hour ago, unravelled said:

I'm just starting with an Aldi printer and I had some similar problems. One reason I found given on a website was absorbed waterin the  fibre, suggesting it should be stored in a dehumidifier, if the printer is normally in a humid area.

 

Hth

 

Dave

Thanks for that, I was not aware of it. In this case the fibre was new and sealed with packs of gel. 

[Kris]

Well, there have been improvements, particularly with the latest print that I have done of the church, at a higher base plate temperature and with slightly thicker walls does not seem to have suffered from delamionation.