On Sunday 23 August 2020 19:00:51 Bruce Layne wrote:
> On 8/23/20 4:32 PM, Gene Heskett wrote:
> > The TPU hasn't arrived, and its way too
> > flexible for this from what I've found on you-tube. Wait for a
> > different design to show up. From what I've learned, the cup of the
> > flexgear could be doubled in depth aspect ratio. Or we need a
> > plastic with more flexability, and tpu isn't it. ABS maybe, its
> > pretty tough stuff. And higher priced too.
>
> I'd advise printing some object such as a tire ("tyre" for Andy) using
> TPU, 90 or 95 on the Shore A scale. Print it with four outer layers
> and 20% infill. You'll have a tough and durable part with some
> compliance. Print the same part with one outer layer and 10% infill.
> You'll have a very soft and flexible part. TPU offers a large range
> of physical properties, in part because of different durometers of the
> filament, typically 85-98 on the Shore A scale, but much more as a
> result of the part geometry, number of outer layers and infill
> percentage.
>
> ABS might be a good choice if you need toughness and PLA is too
> brittle. Like TPU, the part geometry and slicer settings can greatly
> alter the physical properties. ABS is not inherently more expensive
> than PLA, or at least not significantly so. I previously sent a link
> to a source of excellent quality ABS filament for 1.62 cents per gram,
> delivered in the US.
>
If the tpu ever shows up, I'll be back hat in hand for recommendations.
But I'm a sucker, so I've got another drive running, on teeth that are
still starved. So I've raised the steps/mm from 290 to 315, but as soon
as it was started, I ran the tune/flow back up to 120% to get rid of the
skips in the laydown.
One thing of note is that the way the micro-swiss extruder is built, the
8.5mm retraction I was useing to stop the stringing in older slices is
excessive as it pulls hot plastic back far enough to gradually create an
extruder blockage by pulling it back far enough to cool it. They
recommend not more than 2.5mm retract. I think I'm going to like this
design, once I learn its foibles. But it does tend to big drop starts,
and stringing. So parts need more cleanup with a sharp tool.
Thanks Bruce.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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