28 avril 2016

Continuing the search for good print


So, I ws not happy with this horizontal banding and very small waves on sides. so I went through a systematic and  looooooong test processing,  changing parameters and  hardware configuration one by one.  Now I have got more than 30 samples....
There is a good test on thingiverse for that : http://www.thingiverse.com/thing:277394
Most  samples are printer at  70mm/sec minimum

To summarize all changes I did:

  • marlin parameters tuning, especially "Accelerations" and "Jerk"
  • bed and Heater temperature
  • filament flow extrusion rate  (80-120%)
  • extrusion speed, retract speed
  • infill 0 or 25%
  • infill overlap
  • perimeter after infill
  • two types of motor controller (DRV8825, A4988)
  • 2, 8, 16 or 32 bits motor substepping
  • install the print on dampers to avoid vibration resonnance from the table
  • belt tensioning
  • install motors on antivibration support
  • print on various places on the bed
  • reinstall bowden vertically inside a cable chain
  • add some grease to Z axis
  • check all screws
  • reinforce bed structure
  • check and reduce extruder filament compression
and finally:

  • replace sliders with bronze bearing tube by new slider with linear bearing LM8LUU
  • replace Z axis leadscrew TR8x8 by TR8x2 

See pictures below, the black one has been printer with a small compact printer (minifabrikator)




3 commentaires:

François Longin a dit…

super projet et super résultats cet imprimante. Je me regarde a m'en faire une autre et la votre me semble vraiment bien pensée...

Avez-vous déjà fait une liste de pièces et de coût de l'ensemble ??

Vraiment impressionné,

Francois

Token a dit…


Hello!

I'm trying to build a not so big one, with 400x300, do you think I can keep the 8mm rod on X? Is the STLs for the old version still available?

Thanks!

Obor a dit…


Yes the old STL is still available, it's called head_one_extruder_V2 (not X12)