Jump to content

Switching from PLA to ABS: Beginner's guide?


3design

Recommended Posts

Posted · Switching from PLA to ABS: Beginner's guide?

I just tried to print with ABS after having two months of experience with PLA.

I took a black ABS filament from fabbster, diameter about 2.9mm, temperature 220°, packing density 0.85.

It seemed to harden much more faster than the PLA before, and after some layers the print started to mess up and look like a plate of spaghetti.

Re-inserting of PLA was troublesome as well, because the ABS nearly blocked the nozzle (extruding via Ultimaker controller, until the extruding wheel rubbed off too much filament, then cutting out the damaged part, re-inserting), and making a test print which was polluted with ABS.

Before trying a second time I'd prefer to ask you for your experience: What is specific for printing with ABS; do you know any beginner's guide?

 

  • Link to post
    Share on other sites

    Posted · Switching from PLA to ABS: Beginner's guide?

    You used round filament and not their sticks, didn't you?

    I had no problems so far between switching between ABS and PLA, even as I switch a couple of times in one week.

    Try to increase the fan speed and decreasing the speed of extrusion.

     

  • Link to post
    Share on other sites

    Posted · Switching from PLA to ABS: Beginner's guide?

    Yes, it is a reel with round filament, diameter constantly between 2.8 and 2.9mm (rather 2.9).

    What settings do you recommend for the fan speed and the extrusion speed? Or just by "trial and error"?

     

  • Link to post
    Share on other sites

    Posted · Switching from PLA to ABS: Beginner's guide?

    Haven't used ABS myself but I thought 230 was about minimum.

    Also I believe Joegren uses a packing density of 0.97.

    You could just write gcode to squirt about 20mm of filament. Start at 250 Degrees and repeat while lowering the temp by 5 degrees each time until it starts to extrude a bit less. Then choose a temperature 5 or 10 degrees hotter than that.

    In your first print of PLA after maybe go a bit hotter? Also look for posts from Joegren about his printing with it, he has probably written some of the various settings he has used.

     

  • Link to post
    Share on other sites

    Posted · Switching from PLA to ABS: Beginner's guide?

    I never print ABS below 240 and I print Ultimachine ABS at 275 (as displayed on my machine, obviously). I like to live on the hairy edge of jams in order to get maximum strength in my commercial parts, however. I've also taken to printing on Kapton tape and cranking my 160 mA fan to 100% after the first couple of layers (original fan was 100 mA and noticably weaker). Putting layers down as hot as workable minimizes the Achilles heel of FFF/FDM--weak "grain" (incomplete layer to layer bonding) strength. Cooling layers quickly after they are deposited reduces stress accumulation in the part as many layers cool (all layers have to cool sometime). Strain (warping) results when the stress overcomes the bond to the build surface. Actually, strain occurs anyway (like Z-shrinkage); it's just not as bad when the part stays firmly fixed to the build surface.

    Like most people, I've tried countless combinations of things (bubble wrap/heated build chamber to 50C, different bed and nozzle temperatures/ fan profiles, etc. But this approach seem to be the best for my large parts, which span the diagonal of the bed and can be several cm tall. With the best Kapton tape I've ever used, I could actually unplug the heated bed after the first few layers and run the fan 100% and the part still remained stuck and warping was minimized! I found that about 60 - 70 C (the same temp I use for PLA directly on glass) resulted in the best Kapton to glass bed bond and it's quite good after cooling to room temperature too. At times, it's what gives rather than the ABS to Kapton bond.

    I've yet to print a part hotter that wasn't stronger but eventually, you run into problems.

    I'm certain everyone else's mileage will vary!

     

  • Link to post
    Share on other sites

    Posted · Switching from PLA to ABS: Beginner's guide?

    As to cleaning the nozzle from ABS remainders (after swiching back to PLA), I was told to heat up the extruder on 260 C an extrude manually until the outcoming PLA is clean from ABS leftovers. Works pretty good.

     

  • 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

      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
         
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
         
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 48 replies
    ×
    ×
    • Create New...