Jump to content
UltiMaker Community of 3D Printing Experts

Migration to Cura issues


Recommended Posts

Posted (edited) · Migration to Cura issues

Hello all,

 

I recently made many upgrades to my printer and cannot get a good print with Cura, I was previously getting beautiful prints with Slic3r inside Repetier Host and tried my best to port my old setting.

I just upgraded to a Duet3D wifi, Chimera+ hotends, and BondTech BMG extruders as well so there's many new factors. I do have steps/mm and all basic machine settings set correctly for everything though.

 

My top layers look like garbage, blobs on corners, holes, and issues with small details, etc.

I've spent about a month already trying to troubleshoot this and have only made slight improvements, can someone please help?

 

This is for a custom built printer,

 

 

 

ABS PRINT

 

stl and cura profile is attached as well

 

IMG_20190527_180810.jpg

IMG_20190527_180828.jpg

Capture.thumb.PNG.a79641124d6b4af4983d14bc2535d6d7.png.b1ae58bb496c94ff5fc0338f7a4bf608.png

mja5860.curaprofile

GoProMount.stl

Edited by mja5860
clarity
  • Link to post
    Share on other sites

    Posted · Migration to Cura issues

    Well it's really hard to tell.

     

    One issue is that the PLA doesn't seem to be cooling down enough when you get to the 3 "fins".  So slice two of these parts so that it can do a layer on one part and then go do the other part while the first part is cooling a bit.  This will make it easier to see what the other issues are.

     

    Is the fan working for this part?  You want the fan blowing on the part and not the nozzle.  Is it a good breeze?  Feel the breeze with your fingers.  Many people design fan shrouds badly.  I'm thinking you might have too much back pressure for the fans to work and need to open up your shroud.  Or maybe the nozzle cools too much when the fans come on.

     

    So you have zero retractions until you get to the 3 fins.  So the second issue to tackle are retraction issues.  What is the retraction amount and the retraction speed?  Try at 1/10 current speed just to see if it's a speed issue.  when building a cusom printer you need to examine all the settings (jerk, acceleration, max velocity) and find out where the steppers can't go any faster.  This includes the extruder.  Maybe when it retracts it's fine but when it tries to un-retract if fails and you get underextrusion.  Feel the filament while it does the retraction.  Does it feel like it retracted the right amount?  Look over all the retraction settings in cura.  Watch the printer print very carefully.  Use reading glasses.  Slow the printer down to see if it gets better.  Try to see what's different when it "works" and when it doesn't.

     

  • Link to post
    Share on other sites

    Posted · Migration to Cura issues
    17 minutes ago, gr5 said:

    Well it's really hard to tell.

     

    One issue is that the PLA doesn't seem to be cooling down enough when you get to the 3 "fins".  So slice two of these parts so that it can do a layer on one part and then go do the other part while the first part is cooling a bit.  This will make it easier to see what the other issues are.

     

    Is the fan working for this part?  You want the fan blowing on the part and not the nozzle.  Is it a good breeze?  Feel the breeze with your fingers.  Many people design fan shrouds badly.  I'm thinking you might have too much back pressure for the fans to work and need to open up your shroud.  Or maybe the nozzle cools too much when the fans come on.

     

    So you have zero retractions until you get to the 3 fins.  So the second issue to tackle are retraction issues.  What is the retraction amount and the retraction speed?  Try at 1/10 current speed just to see if it's a speed issue.  when building a cusom printer you need to examine all the settings (jerk, acceleration, max velocity) and find out where the steppers can't go any faster.  This includes the extruder.  Maybe when it retracts it's fine but when it tries to un-retract if fails and you get underextrusion.  Feel the filament while it does the retraction.  Does it feel like it retracted the right amount?  Look over all the retraction settings in cura.  Watch the printer print very carefully.  Use reading glasses.  Slow the printer down to see if it gets better.  Try to see what's different when it "works" and when it doesn't.

     

     

    I should have clarified, my post has been edited for clarity. This is ABS and I usually don't print with anything else.

     

    I have retraction distance set to 6mm and 30mm/sec and it definitely retracting as it should, I did check that. I had the setting honed in very well before with Slic3r but I have yet to enable jerk with Cura so I guess I can try that next. I have a pretty large bowden tube due to the size of my printer but that has never been an issue. Should be even less of an issue now with the bondtech extruders and capricorn tubing.

     

    I have slowed it down and saw minor improvements but the thing that is the weirdest to me is that at 100% flow rate, it for sure underextrudes. I have to turn it up to 150% to see the results in the images above which has to mean there is an issue some where. I ALWAYS had it at 100% before with my old setup. The extruders steps/mm is correct and I fiddled with the filament diameter settings in Cura as well.

     

    My Cura profile is actually attached to my first post if that helps at all

  • Link to post
    Share on other sites

    Posted · Migration to Cura issues

    First of all I turned on jerk and slowed down the print speed to 30 mm/sec and turned down a couple acceleration settings. The infill looks amazing now where before it was very messy.

     

    Since you mentioned retractions, I did turn that down to 4mm and like 20 mm/sec and noticed my bowden tube was loose on the extruder side so fixing all of that I was able to actually finish the print and get decent results on the gopro fin mounts. I'm not too worried about that, I can fine tune that still.

     

     

    Main issues at hand:

     

    I have it at 150% flow in order to not underextrude.... ???

     

    And secondly, the skin looks horrible and full of gaps. I've messed with the settings that deal with the skin but nothing noticeable changes.

    IMG_20190528_161343.jpg

    IMG_20190528_161421.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 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 22 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
         
         
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
         
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
         
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.
         

         
        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
         
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 22 replies
    ×
    ×
    • Create New...