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[UM2] printing large object in PLA fails.

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Hi everyone,

I've designed a case for one of my projects, see picture. The first attempt to print the case failed.


Dimensions (LxWxH): 205x135x100mm.

Problem 1: warping at 3 corners. The material I use is PLA from Ultimaker, with the following print settings:


  • nozzle temperature: 210°C
  • bed temperature: 65°C
  • fan speed: 100%


I used a brim of 4mm and the glassplate has some glue on it. Normally this works fine but in this case definitely not.


Problem 2: The right hole on the picture below should be round (8mm) but it's oval. Support material is set to everywhere in Cura with a grid pattern and a density of 15%. The smaller round holes and rectangle holes are good.


Problem 3: With the default initial layer speed of 20mm/s it's impossible to print the inner- and outer wall of the two holes at the bottom correctly. I have to lower the speed to 10mm/s, this gives a better result althought it's not perfect.


How can I fix these problems and improve the print quality ?



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For the bonding, have you tried the "salt method"? First, thoroughly clean the glass plate with warm water (without soap, this reduces bonding). Then wipe the plate with a tissue moistened with salt water. Gently keep wiping while it dries, so it leaves a very thin, almost invisible mist of salt stuck to the glass plate. For me this greatly increases bonding, and it works even for difficult models (e.g. thick 100% filled). I never use brim or raft for my models, the salt method works well enough.

For a full description and photos, see the manual:


Edited by Guest

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