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jones007

breakaway ooze wrecks auto-level

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Posted · breakaway ooze wrecks auto-level

I'm not sure if this issue has been addressed before - if so, perhaps someone can point me toward the appropriate thread. I have an older u3 and a couple of S5s, and the S5s have been driving me crazy with auto-level failures due to ooze on breakaway support material. The U3 suffers from a similar problem, but it is easily remedied by carefully cleaning the tip with the breakaway material before active leveling begins. On the S5, no amount of cleaning fixes the problem. Here's what is happening:

 

  • The printer is ready for a new print, either still warm from the previous print, or completely cooled after a rest period.
  • I make sure both nozzles are clean.
  • I start a job with a build material plus breakaway support.
  • The S5 starts to heat the nozzles and build plate. As the nozzle with breakaway material heats, some material oozes from the nozzle. I clear it.
  • It moves the head to the back right and appears to try to squish any material on both nozzles on the build plate.
  • It then re zeros x,y and then goes through the leveling for nozzle 1. As it does this, breakaway material starts to ooze out of nozzle 2.
  • It re zeros x,y then switches nozzle 2 to the down position. By now there is a glob of breakaway material that has oozed out of nozzle 2 and cooled.
  • It hits the 3 level check points, but incorrectly measures the depth of nozzle 2 due to the cooled glob.
  • It then starts the print, but the breakaway material is emitted too far from the build plate and does not stick.
  • A short time later I check to see if the print is working and discover a huge rats nest of breakaway material floating around the build plate.
  • I abort the print after screaming some profanity at the printer and repeat.
  • After about 3 or 4 tries at this, apparently the nozzle has oozed enough and the print succeeds.
  • This entire sequence requires about 30 to 45 minutes of babysitting the printer to make sure the jobs actually start correctly.

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