Re: 3D Printers

From	DJ Delorie <dj@delorie.com>
Newsgroups	sci.electronics.design
Subject	Re: 3D Printers
References	(15 earlier) <10d4lo9$2vuea$2@dont-email.me> <xn347de9gk.fsf@delorie.com> <10d6fra$3honb$1@dont-email.me> <xny0p5cb9t.fsf@delorie.com> <10d6o71$3jr48$1@dont-email.me>
Date	2025-10-21 11:58 -0400
Message-ID	<xntszsckms.fsf@delorie.com> (permalink)

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Don Y <blockedofcourse@foo.invalid> writes:
> No doubt.  But, the A filament would likely have cooled before you
> got around to the B.  Wouldn't this affect adhesion between the substances?
> I.e., do such "joints" have less strength than continuous runs of *either*
> substance?

Yes and no.  Inter-layer strength is much below cross-layer strength,
but the old layer is still hot enough that the heat from the new
extrusion is enough to fuse them.  The software adjusts temperatures to
make sure this happens, so having it happen for intra-layer adhesion is
a given.

For some prints and plastics, the problem is cooling it fast enough, not
having it cool too fast.  Most printers have part cooling fans.
Printers and slicers are really good at managing thermal loads.

> But that isn't too bad.  I.e., if you had LED emitters on 0.1" centers,
> you'd be able to see them as individual sources instead of "diffused"
> into a composite.

Yup, if they were up against the clear plastic.

>> You would print light barriers (opaque) into the back of the panel to
>> guide the light to where you wanted it.
>
> But that would require the windows (and emitters) to be farther apart
> and/or closer to the emitters (Z axis).

Printed walls can be 1mm or less in width, and arbitrarily tall.  My
printer can print 0.25mm walls.

> The sample you referenced above seems like it could avoid these problems
> but that may not be possible with other materials?

I don't think it's a material issue, unless you can find a plastic with
the same reflective constants as air ;-)

>>> OK, that's easier to understand.  The restriction for hysterical raisins?
>> Cheap 8-bit microcontrollers, plus no need.
>
> Someone made a tradeoff (space vs smarts), in the past.  It could just as
> easily have been a "smarter" hardware interface with delayed value binding
> (e.g., resolve symbols at print time).

It's so easy to regenerate a gcode file in the slicer these days, that
the main factor is the "no need" part.  Modern printers use fast 32-bit
processors and nobody has bothered making the gcode smarter.  Faster and
smaller, sure, but not smarter.  The parameters you want are in the
slicer, just slice it again.

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3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-16 18:53 -0700
  Re: 3D Printers Martin Brown <'''newspam'''@nonad.co.uk> - 2025-10-17 09:45 +0100
    Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-17 02:05 -0700
      Re: 3D Printers Martin Brown <'''newspam'''@nonad.co.uk> - 2025-10-17 12:11 +0100
        Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-17 04:53 -0700
  Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-17 13:20 +0100
    Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-17 08:22 -0700
      Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-17 19:24 +0100
        Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-17 13:27 -0700
          Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-18 11:02 +0100
            Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 06:20 -0700
              Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-18 15:36 +0100
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 07:58 -0700
              Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 18:01 -0700
                Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-19 08:37 +0100
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 01:04 -0700
                Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-19 11:11 +0100
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 04:26 -0700
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 04:52 -0700
                Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-19 16:46 +0100
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 13:22 -0700
                Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-20 01:33 -0400
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 23:44 -0700
                Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-20 14:04 -0400
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-20 16:15 -0700
                Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-20 21:07 -0400
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-20 18:38 -0700
                Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-21 11:58 -0400
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-21 09:47 -0700
                Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-21 13:28 -0400
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-22 01:22 -0700
                Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-20 15:19 +0100
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-20 07:50 -0700
        Re: 3D Printers albert@spenarnc.xs4all.nl - 2025-10-18 09:17 +0200
      Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-17 20:22 +0100
        Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-17 13:42 -0700
          Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-18 11:25 +0100
            Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 07:39 -0700
              Re: 3D Printers Theo <theom+news@chiark.greenend.org.uk> - 2025-10-18 17:17 +0100
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 09:41 -0700
          Re: 3D Printers antispam@fricas.org (Waldek Hebisch) - 2025-10-18 12:36 +0000
            Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 06:52 -0700
              Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 02:03 -0700
      Re: 3D Printers albert@spenarnc.xs4all.nl - 2025-10-18 09:12 +0200
      Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-19 00:44 -0400
        Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 22:04 -0700
          Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 22:08 -0700
            Re: 3D Printers liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-10-19 10:34 +0100
              Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 03:44 -0700
          Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-20 00:53 -0400
            Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 22:08 -0700
              Re: 3D Printers DJ Delorie <dj@delorie.com> - 2025-10-20 01:50 -0400
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-19 23:59 -0700
                Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-20 00:01 -0700
    Re: 3D Printers john larkin <jl@glen--canyon.com> - 2025-10-17 08:32 -0700
      Re: 3D Printers Bill Sloman <bill.sloman@ieee.org> - 2025-10-19 02:10 +1100
        Re: 3D Printers john larkin <jl@glen--canyon.com> - 2025-10-18 09:09 -0700
          Re: 3D Printers Lasse Langwadt <llc@fonz.dk> - 2025-10-19 03:46 +0200
            Re: 3D Printers john larkin <jl@glen--canyon.com> - 2025-10-18 20:11 -0700
            Re: 3D Printers liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-10-19 10:34 +0100
              Re: 3D Printers Lasse Langwadt <llc@fonz.dk> - 2025-10-19 14:41 +0200
                Re: 3D Printers liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-10-19 15:29 +0100
                Re: 3D Printers Lasse Langwadt <llc@fonz.dk> - 2025-10-20 17:35 +0200
                Re: 3D Printers liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2025-10-20 17:22 +0100
                Re: 3D Printers Lasse Langwadt <llc@fonz.dk> - 2025-10-21 01:17 +0200
          Re: 3D Printers Bill Sloman <bill.sloman@ieee.org> - 2025-10-19 16:32 +1100
      Re: 3D Printers Lasse Langwadt <llc@fonz.dk> - 2025-10-19 03:41 +0200
        Re: 3D Printers Don Y <blockedofcourse@foo.invalid> - 2025-10-18 20:38 -0700

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