Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  
3design

Switching from PLA to ABS: Beginner's guide?

Recommended Posts

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?

 

Share this post


Link to post
Share on other sites

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.

 

Share this post


Link to post
Share on other sites

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!

 

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
Sign in to follow this  

Announcements

  • Our picks

    • Architect Design Contest | Vehicles.
      We're open for entries! - Design and submit your 3D designs of architectural entourage - vehicles - for a chance to win a large filament pack. Presenting an idea, an architectural design or something as big as an urban project isn't easy. A scaled model can really help to get your idea across.
        • Like
      • 25 replies
    • What The DfAM?
      I'm Steve Cox, an experienced engineer familiar with 3D printing. I wanted to share some DfAM guidelines with this community to help and make stronger parts.
      I'm also an Autodesk Certified Instructor for Fusion 360, so many of the images in ...
        • Thanks
        • Like
      • 23 replies
×

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!