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NYarvin's profile
Norman Yarvin
Norman Yarvin
Norman Yarvin
@NYarvin

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Norman Yarvin

@NYarvin

yarchive.net/blog
Joined April 2013

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    1. Norman Yarvin‏ @NYarvin Jan 7
      • Report Tweet
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      Replying to @xiphmont

      Expansion/contraction sounds a bit weird as a cause of electrical potentials. How about it being the liquid plastic acting sort of like a Van de Graaff generator as it passes through the nozzle?

      1 reply 0 retweets 0 likes
    2. Monty [the rider]‏ @xiphmont Jan 7
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      Replying to @NYarvin

      I think what's actually happening there is the heating/cooling warping pulling the plastic up from the bed slightly in bursts. Certainly, popping a thin PETG part free with tweezers is a sure-fire way to bork the display/spontaneously reset the printer.

      2 replies 0 retweets 0 likes
    3. Norman Yarvin‏ @NYarvin Jan 7
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      Replying to @xiphmont

      Hmm. That could be already-charged plastic suddenly moving and generating a change in electric fields, or it could be plastic picking up a charge as it detatched.

      1 reply 0 retweets 1 like
    4. Monty [the rider]‏ @xiphmont Jan 7
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      Replying to @NYarvin

      I would expect parting to create a charge. I would also expect a sharper-edged metal implement that picks up the charge to be more effective than the plastic at concentrating the charge to the point it gets past the powdercoat.

      1 reply 0 retweets 0 likes
    5. Norman Yarvin‏ @NYarvin Jan 7
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      Replying to @xiphmont

      You don't need conduction through the powdercoat; electric fields going through it are enough. Electrostatic charges are commonly kilovolts; even a slight echo of that will scramble signals.

      1 reply 0 retweets 1 like
    6. Monty [the rider]‏ @xiphmont Jan 7
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      Replying to @NYarvin

      True. That said, there's usually a discernible discharge, and I've not noticed the same tendency with the smooth PEI sheet (made from continuous PEI as opposed to powdercoat). I'll go test.

      2 replies 0 retweets 0 likes
    7. Norman Yarvin‏ @NYarvin Jan 13
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      Replying to @xiphmont

      Okay, if the surface texture matters that definitely means the charge is generated by the interaction with the surface as it breaks loose, not (as I'd suggested) some bulk thing.

      1 reply 0 retweets 1 like
    8. Norman Yarvin‏ @NYarvin Jan 13
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      Replying to @NYarvin @xiphmont

      I'm still a bit confused as to what you mean by "powdercoat", though; to me it means a finish applied as a powder and held on by electrostatic charge until it's baked, usually ending up smooth and glossy.

      1 reply 0 retweets 1 like
    9. Norman Yarvin‏ @NYarvin Jan 13
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      Replying to @NYarvin @xiphmont

      That sort of powdercoat is usually applied to metal, since it can take the high heat and can be uniformly charged to attract the powder.

      1 reply 0 retweets 1 like
    10. Monty [the rider]‏ @xiphmont Jan 13
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      Replying to @NYarvin

      Yeah, the spring steel textured sheets are powdercoated using the process you describe. It crosslinks with heat. It actually tends to make for a pretty poor insulator; lots of voids, nonuniform linking.

      2 replies 0 retweets 0 likes
      Norman Yarvin‏ @NYarvin Jan 14
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      Replying to @xiphmont

      That's about what I'd expect if they decided to make the surface rough by lowering the bake temperature: a coating that's not fully consolidated.

      8:22 AM - 14 Jan 2020
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      • Monty [the rider]
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        2. Monty [the rider]‏ @xiphmont Jan 14
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          Replying to @NYarvin

          It's more an intentional feature of the coating, optimizing for the rough texture over anything else. It's not intended to be an insulator, and it really isn't. Static discharges go right through.

          1 reply 0 retweets 0 likes
        3. Monty [the rider]‏ @xiphmont Jan 14
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          Replying to @xiphmont @NYarvin

          If the bake was too low, adhesion and crosslink would suffer. It's surprisingly durable; really I'm kind of astounded at how well it holds up in use. So I don't think the bake temp was off.

          1 reply 0 retweets 0 likes
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