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Robo R2 Overhang Tests

Discussion in 'Show and Tell' started by Ed Ferguson, Jun 9, 2017.

  1. Ed Ferguson

    Ed Ferguson Active Member

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    Made these Robo R2 overhang prints at 0.1mm layer height using Robo PLA and sliced on Simplify3D. The print on the right was just under 10 hours.

    https://www.thingiverse.com/thing:2374380
    https://www.thingiverse.com/thing:699366

    The backside of the print on the left is a little scruffy at the 70 & 80 degree points. Of course this torture test was done with no supports. It helps to know what's possible when designing models. Some folks use a rule of thumb of avoiding overhangs greater than 45 degrees. Going 60 degrees is no problem on the R2, and 70 or 80 degrees is fine if you can live with the underside. This model acted as a spring and I could see the top getting pushed down as the nozzle built the 70-80 degree areas. An 80 degree overhang coming off a more ridged base would perform better.

    Overall I'm very happy with the results.

    Robo R2 Overhang Test 6.JPG
     

    Attached Files:

    #1 Ed Ferguson, Jun 9, 2017
    Last edited: Jun 9, 2017
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  2. Geof

    Geof Volunteer Moderator
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    well done!
     
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  3. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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  4. Todd Wessendorf

    Todd Wessendorf Active Member

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    Stupid question, but are those printed with "rafts"? I've seen it in the settings, but never selected it. What are the pros/cons of rafts?
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Pros - your print is stuck to the bed like glue
    Cons - Your print is stuck to the bed like glue (and the bottom may look nasty)
     
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  6. Geof

    Geof Volunteer Moderator
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    Pros- none

    Cons- EVERYTHING...including wasted material

    Exception: if you have a rediculously organic model where parts of it keep falling over and it WASN'T modeled with 3D printing in mind...rafts are acceptable ;)
     
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  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yea, serious;y only tall, narrow prints that have no base to speak of do I use a raft on and since I control the model and orientation that is rare
     
  8. Ed Ferguson

    Ed Ferguson Active Member

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    Todd - Yes, they're rafts.

    I added a raft to the 80 degree overhang model because it's off balance and the extra anchoring to the bed helped.

    I forgot to turn off the raft checkbox on the larger model. Not needed at all, and as Mark stated, a real b*tch to remove from the bed.

    Normally I've used brims and not rafts if I think extra anchoring is needed.
     
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  9. Todd Wessendorf

    Todd Wessendorf Active Member

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    Understood. Thanks!
     
  10. pclabtech

    pclabtech Active Member

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    That looks really nice. I will try printing one with .1mm but all I have is Cura so no fancy settings to tweak my output.
     
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  11. Kilrah

    Kilrah Well-Known Member

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    Those are beautiful... where the heck is my tracking number, can't take it anymore seeing all those cool things! :D
     
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