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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. Monty [the rider]‏ @xiphmont May 6
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      Anyway, it turns out my PPE printing has now slammed hard into the max throughput of the Atmega. Time to make code faster. I see lots of divides and soft floats in the planner that can go away...

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    2. Monty [the rider]‏ @xiphmont May 6
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      Too bad I'm also hard out of SRAM and flash space.

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    3. Monty [the rider]‏ @xiphmont May 6
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      OK, wow, doubling the planner depth does a ton to improve command throughput. Around 30% or so. The math is still too slow, but there's also a bunching issue exacerbating it.

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    4. Monty [the rider]‏ @xiphmont May 6
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      BTW, finding the extra RAM free to do that meant disabling SD support entirely. And you can tell it's been at least a few years since anyone officialish has tried to compile MK3S firmware with SDSUPPORT turned off :-)

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    5. Monty [the rider]‏ @xiphmont May 6
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      OK, not 30% upon closer inspection. More like 15%, maybe 20. That's more believable. A deeper buffer will smooth things out some, but can't compensate for 'long term throughput is still too low'.

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    6. Norman Yarvin‏ @NYarvin May 7
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      Replying to @xiphmont

      Have you discovered monster nozzles yet? (As in, 1mm or greater.) Does a lot for throughput.

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    7. Monty [the rider]‏ @xiphmont May 7
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      Replying to @NYarvin

      Unless paired with an equally monster heatblock, heater and melt zone, a bigger orifice can't move more plastic than the thermodynamics can melt... An e3d v6 is going to be limited to 8mm^3/s nominal with PETG (12 if you're pushing it) regardless of nozzle size.

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    8. Norman Yarvin‏ @NYarvin May 7
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      Replying to @xiphmont

      Huh? My E3D v6 clone with a 40W heater and a 1mm nozzle puts down a 1mm wide * 0.7mm high strip of PETG at 30 mm/s just fine. That's 21 mm^3/s.

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    9. Monty [the rider]‏ @xiphmont May 7
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      Replying to @NYarvin

      How long can it do that, and which PETG? :-) I see cold adhesion failures and texture changes up over 12mm^3/s with PETG that has a high pigment load. I don't exceed that printing masks here. 14mm^3/s produced brittle prints. e3d's official v6 rating for PETG is 8mm^3/s.

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    10. Norman Yarvin‏ @NYarvin May 7
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      Replying to @xiphmont

      It keeps it up indefinitely, even running prints which involve nearly constant extrusion. This is Overture brand white PETG (my first whack at PETG, bought as a cheap experiment.)

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      Norman Yarvin‏ @NYarvin May 7
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      Replying to @NYarvin @xiphmont

      I'll do a speed-of-light calculation here. This data sheet: https://devel.lulzbot.com/filament/Rigid_Ink/PETG%20DATA%20SHEET.pdf … seems to have all the relevant numbers, including heat capacities at various temperatures up to and including melting.

      1:24 PM - 7 May 2020
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        2. Norman Yarvin‏ @NYarvin May 7
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          Replying to @NYarvin @xiphmont

          Using an eyeballed rough average of those heat capacity numbers, and plugging it into 'units', I get: You have: 1800 (J/kg/K) * 240 K * (1.27 g/cm^3) You want: watt / (mm^3/s) * 0.54864 So a bit over half a watt per mm^3/s.

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        3. Norman Yarvin‏ @NYarvin May 7
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          Replying to @NYarvin @xiphmont

          Which means a 40 watt heater tops out at maybe 70 mm^3/s. Of course that's absolute maximum speed, ignoring practicalities like heat loss to the outside. And thermal conductivity might be the real limit here, making this calculation irrelevant. But raw wattage isn't a problem.

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