Jump to content

Recommended Posts

Posted · Can you explain this? Ugly surface on ABS Top flat layer, 4 benchs w/photos

Hi everyone, I joined this forum particularly because this issue.

 

I'm new on 3D printing, and bought a CR-10s, 0.4 mm nozzle last week that runs beatyful. I managed to get an UP! ABS filament (theorically 270 °C nozzle temp. required) and I made some benchmarks to calibrate nozzle and bed temp., and extrusion flow rate (discribed below).

 

As you can see, the surface of the top layer is extrange; this effect happened me in another model I printed before, and I searched for it in common 3D printing problems lists but didn't find it (I dont even know this issue name!). I made some changes between each print, but as you can tell, the problem always remained. The explanation of some parameters are justified below.

 

DSC_0053.thumb.jpg.ec325b99460f661f3d05f8c7c01a8abf.jpg

 

DSC_0054.thumb.jpg.f9bb5a4871acec3a0a1b6b027e9ec726.jpg

 

DSC_0055.thumb.jpg.4080ff4e91023047e8c3c68917752150.jpg

 

I use Cura 3.2.1

Regular Print settings are:

Layer height: 0.2 mm, Wall thickness: 0.8 mm, Top/Bottom thickness: 0.6 mm, 20 % triangles infill, 121 % Flow rate, Travel speed: 120 mm/s, ABS Slurry as bed-adhesion, Retraction distance: 5 mm, 4 lines skirt, big plastic bag as enclosure.

 

Particular Print settings are, from left to right:

1) Nozzle temp.: 260 °C (max CR-10s capable temp.), Bed temp.: 80 °C, Fan: NO, Print speed: 60 mm/s

2) Nozzle temp.: 252 °C (obtained from temp. bridge bench), Bed temp.: 80 °C, Fan: YES (255 rpm), Print speed: 60 mm/s

3) Nozzle temp.: 252 °C, Bed temp.: 80 °C, Fan: NO, Print speed: 60 mm/s but decreased to 50 % in LCD screen (I guess it is percentage, it has no unit displayed)
4) Nozzle temp.: 260 °C, Bed temp.: 80 °C, Fan: NO, Print speed: 40 mm/s, Minimum layer time: 5 sec

(Notice that the 4th cube is turned 180° over the Z axis, the issues look exactly the same when facing the proper way)

 

About flow rate: After an extrusion lack in another print, I decided to make a simple 20 x 20 x 20 print, 0.8 mm thick wall, without bottom and top and use a caliper to measure the thickness. At the end I stablished 121 % flow rate to get a 0.8 ± 0.05 mm wall.

 

Do you know what could be so wrong, that the surface finish so horrible is? Should I try to print at lower nozzle temp., even further from the suggested 270 °C? The same problem was found in a model I printed for the lab, but I dont know if its clear in this image:

 

DSC_0032.thumb.JPG.3f76e99dd4f34479c123917d23a05b27.JPG

 

Thanks in advance! I hope we can solve this together :)

DSC_0053.jpg

DSC_0054.jpg

DSC_0055.jpg

DSC_0032.JPG

  • 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
    • Our picks

      • UltiMaker Cura 5.9 stable released!
        Here comes Cura 5.9 and in this stable release we have lots of material and printer profiles for UltiMaker printers, including the newly released Sketch Sprint. Additionally, scarf seams have been introduced alongside even more print settings and improvements.  Check out the rest of this article to find out the details on all of that and more
          • Like
        • 5 replies
      • Introducing the UltiMaker Factor 4
        We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
          • Heart
          • Thanks
          • Like
        • 4 replies
    ×
    ×
    • Create New...