Jump to content
paulrhee2002

Newbie test cube printing walls lines separated in pla

Recommended Posts

Posted · Newbie test cube printing walls lines separated in pla

I had (somewhat) successfully printed a test cube with flexible filament but when test printing with pla, each wall line is completely separated from the other walls.  It looks like concentric infill vs a 3 line solid wall.  I did mess with cura settings in between the flex test cube and pla test cube.

I am using a tevo black widow with cura and the cube was downloaded from thingiverse.  

I have attached pics of the cube (bottom broke off) as well as pics of my cura settings.

Newbie question but appreciate any help!

IMG_0162.JPG

IMG_0163.JPG

IMG_0164.JPG

IMG_0165.JPG

IMG_0166.JPG

IMG_0167.JPG

Share this post


Link to post
Share on other sites
Posted · Newbie test cube printing walls lines separated in pla

The problem is you have severe underextrusion.  Maybe about 50%.

 

Your print speed looks to be 30mm/sec with 0.3 layer height and 0.4 line width that is 30*0.3*0.4 or 3.6 cubic mm/sec.  That should be doable.  So I'd guess your feeder is somewhat weak.  You need about 5 pounds or 3kg force to push hard enough to print at that speed with typical printing temps (220C).  So I'd test the feeder and make sure it can pull that hard. 

 

One way to test is to energize the feeder but don't advance it and then pull back on the filament hard and see how much force it takes for the filament to slip.

 

Share this post


Link to post
Share on other sites
Posted · Newbie test cube printing walls lines separated in pla

Thanks for the reply!!!!  I did loosen my feeder tightening screws and will try tightening them more and reprint.

Will follow up after re-printing!

 

Share this post


Link to post
Share on other sites
Posted · Newbie test cube printing walls lines separated in pla

You are the best!  When I switched filaments I didn't tighten the feeder screws as much thinking I don't want to over-tighten.

The prints came out so much better now, but any other flaws in the print and/or advice you have is all greatly appreciated!

Thanks again so much.  I spent nearly a week changing cura settings....  I should have asked sooner.  Thank you again.  

reprint side.jpg

reprint top.jpg

reprint bottom.jpg

Share this post


Link to post
Share on other sites
Posted · Newbie test cube printing walls lines separated in pla

I also increased the nozzle temp to 210.  Still to low?  Does the top layer seems lumpy on the perimeter lines?

Share this post


Link to post
Share on other sites
Posted · Newbie test cube printing walls lines separated in pla

To me this seems reasonably okay, it looks like what you could expect at 0.3mm layer height. Although there seems to be a bit of "elephant feet" at the first layers (=thick bottom). There may be other reasons, but often this is caused by a bed temperature that is a little bit too high for the material, so the first layers sag a bit. Maybe you could try to lower your bed temperature by 5°C and test if the model still sticks well? Stay with the print, in case the model would come off, so you can abort.

 

When printing on a glass bed (I don't know what bed your printer has), we often have to find a balance between bed temp and good bonding. A too low temperature reduces bonding, and the model may suddenly pop off while printing. A too high temperature also reduces bonding: the model stays too weak, and warping forces tend to peel off the model gradually, in my tests.

 

In both my UM2, and for PLA, the best bed temperature was the default indeed, 60°C. Although 55°C also worked usually. At 45...50°C the models would suddenly pop off. At 65...70°C they would get severe elephant feet and would be peeled off. This will differ from material to material, and printer to printer, so I recommend doing test prints at various bed temps, and definitely stay with the printer!

 

Share this post


Link to post
Share on other sites
Posted · Newbie test cube printing walls lines separated in pla

Hello, I am following up with you regarding another issue.  You were so helpful last time thank you!

I switched my nozzle to 1mm because my prints need speed vs detail.

Not sure whats going on.  Is this under-extrusion again?

I printed a filament spoolholder but it's not so smooth and has to pull pretty hard for the spool to turn.

 

I printed at .8 layer height and 1 mm line width.  25mm/s speed, 215 nozzle temp, 60 bed temp, 15% infill, 3 wall lines and 2 top/bottom layers

Maybe that's a factor?  Any help is always appreciated!!!!

1mm cube angle.jpg

1mm cube bottom.jpg

1mm cube side.jpg

1mm cube side1.jpg

1mm cube top.jpg

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!