Comment on Ender 3 V2 damage?

• KingRandomGuy@lemmy.world ⁨1⁩ ⁨week⁩ ago

  PETG will almost certainly be fine. Just use lots of walls (6 walls, maybe 30% infill). PETG’s heat resistance is more than good enough for a non-enclosed printer. Prusa has used PETG for their printer parts for a very long time without issues.

  Heat isn’t the issue to worry about IMO. The bigger issue is creep/cold flowing, which is permanent deformation that results even with relatively light loads. PLA has very poor creep resistance unless annealed, PETG is a quite a bit better. ABS/ASA would be even better but they’re much more of a headache to print.

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  • bluewing@lemm.ee ⁨1⁩ ⁨week⁩ ago

    Infills over 10 to 15 percent get you very little increase in strength. It’s not until you get to the sweet spot of 80-85 percent infill rates do you get a real boost in strength. Then above about 85% the gains again taper off dramatically all the way to 100% infill. Otherwise you are merely wasting filament and money to just feel good. If you need more strength, add more perimeters and tops and bottoms.

    I would use a .60mm nozzle, PETG or PLA will work just fine, 4 perimeters, and 4 top and bottom layers. And either 10% cubic or gyroid infill. That should create a part that will last for years.

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    • beastlykings@sh.itjust.works ⁨1⁩ ⁨week⁩ ago

      Thanks!

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    • KingRandomGuy@lemmy.world ⁨1⁩ ⁨week⁩ ago

      In my experience doing a bit more than 10% can be helpful in the event of underextrusion, plus I’ve seen it add a bit more rigidity. But you’re right that there are diminishing returns till you start maxing out the infill.

      4 perimeters at 0.6mm or 6 at 0.4 should be fine.

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  • beastlykings@sh.itjust.works ⁨1⁩ ⁨week⁩ ago

    That’s good to know, maybe I’ll give it a go then 👌

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  • remotelove@lemmy.ca ⁨1⁩ ⁨week⁩ ago

    Totally. There is heat from repeated deformation, but I didn’t explain how little heat it was, so I clarified in a later comment. All motion creates heat, etc, etc. (TBH, I shouldn’t have mentioned it. Oh well. I let that cat out of the bag, so it’s too late.)

    But also yes, I have experienced PLA “cold flowing” on some parts as a well so I can confirm that for sure.

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    • KingRandomGuy@lemmy.world ⁨1⁩ ⁨week⁩ ago

      All good, it’s still something to keep in mind (especially if OP thinks about enclosing their printer in the future). Thanks for your comment!

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• remotelove@lemmy.ca ⁨1⁩ ⁨week⁩ ago

  Keep in mind that any heat created from stress on plastic will still be minimal and it will just take lots of time to create visible deformation. You can mitigate this mostly by printing critical parts at 100% infill.

  I always over-engineer parts that are mechanical. That is just my preference. If you look at the original part, it is likely designed to be strong on only one axis. This saves money and time for bulk manufacturing. (Compensate home prints with better materials or bulkier parts is my own rule of thumb. Everything is a trade-off, is my point.)

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  • beastlykings@sh.itjust.works ⁨1⁩ ⁨week⁩ ago

    Maybe I’ll take a crack at it then, thanks!

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    • remotelove@lemmy.ca ⁨1⁩ ⁨week⁩ ago

      Please do! Success is awesome, but failure is important. Enders are pure hobby printers, after all. Half the fun is tearing them apart, rebuilding components and learning what works and what doesn’t for your own use cases.

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  • KingRandomGuy@lemmy.world ⁨1⁩ ⁨week⁩ ago

    IMO heat formed from stress will not be a big deal, especially considering that people frequently build machines out of PETG (Prusa’s i3 variants, custom CoreXYs like Vorons and E3NG). The bigger problem is creep, which suggests that you shouldn’t use PLA for this part.

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    • morbidcactus@lemmy.ca ⁨1⁩ ⁨week⁩ ago

      Petg inside the enclosed though can definitely have a short service life, the original x axis idler on my mk3s gave up the ghost after a month or so of pretty consistent printing of abs in the summer, had expected it so i the first thing I did in abs was a set of prusa spares which lasted until I did a bear mod last year.
      There’s obviously variation in filament though so YMMV, petg is still a solid material to use if you don’t have an enclosure (though I’m always recommending then if only for gasses and fine particles while printing)

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      • KingRandomGuy@lemmy.world ⁨1⁩ ⁨week⁩ ago

        Yeah, I agree. In the photo I didn’t see an enclosure so I said PETG is fine for this application. With an enclosure you’d really want to use ABS/ASA, though PETG could work in a pinch.

        I also agree that an enclosure (combined with a filter) is a good idea. I think people tend to undersell the potential dangers from 3D printing, especially for people with animals in the home.

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