Most, if not all slicers know to offset the extrusions to create
dimensionally accurate parts. If you're ending up with parts that are 0.2mm
big on every side that means you're out of calibration somehow. 0.2 is
probably a decent margin for fitting parts together, but not for that
reason.

On Sat, Jul 24, 2021 at 4:12 PM Gene Heskett gheskett@shentel.net wrote:

On Saturday 24 July 2021 19:45:21 Gareth Chen wrote:

I installed prusa's prusaslicer but that was a disaster, everything was
at least a mm oversized, and flow was 2x what it needed, so
i'm back to cura. It at least has some flow controls but I'm still fine
tuning the rest of it.

Thanks all.

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

Nophead's blog is full of interesting stuff, like this for holes:
https://hydraraptor.blogspot.com/2011/02/polyholes.html
&
https://hydraraptor.blogspot.com/2020/07/horiholes_36.html

Things to keep in mind in your designs.

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Gene:

PrusaSlicer has been PERFECT for me and my MK3S printers.  I encourage
you to give it another try.  PrusaSlicer and the MK3S are matched
together.  Is there any possibility that you specified something
incorrectly (like nozzle diameter or printer model number)?

Jon

On 7/24/2021 8:39 PM, Gene Heskett wrote:

Yeah, I also get great results with PrusaSlicer.  Are you aware that by
default it only exposes the "basic" settings?  If you enable the expert
settings there are tons of options.  But I would first see if you can find
settings tuned to your printer that somebody else has worked out.

On Sat, Jul 24, 2021 at 8:48 PM jon jon@jonbondy.com wrote:

On Saturday 24 July 2021 20:47:52 jon wrote:

I haven't nuked it, so I might give it another try, but from the looks of
the skirt or brim it was putting down with a 1st layer at .18mm,
(measured by peeling it off and miking it) it was squirting out and
laying down a nearly 1.75mm wide line .19mm thick from a .4mm nozzle,
and was throwing out blobs tall enough to catch the leveler probe, a
magnetic induction version, catching it hard enough to make x lose home.

I looked for flow controls ala cura style but didn't find any. So I went
back to cura. By setting cura flow to 90% and then setting it in the
printer to 85 or 90% there too, its a lot better, but the biggest diff
in getting a cleaner print, was cranking the speed up, way up, after the
1st layer is stuck, 250% was a good start. So I /think/ the 3rd pass at
part #2, on the bed now might be usable but has not yet been test
fitted. 2nd pass it all blew up, I wound up with a golf ball sized glop
of plastic welded to the hot block, Prusa didn't supply, nor do they
show one in use, a silicon sock for the hot block. I have a bag of them
and may try putting one on tomorrow just for S&G.

Thanks.
[...]

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

On 7/24/2021 10:14 PM, Gene Heskett wrote:

Filament Settings / Filament / Extrusion Multiplier.  Visible only in
Advanced or Expert modes, not Simple mode.

On Sunday 25 July 2021 01:16:46 Jordan Brown wrote:

I saw that, and wondered what it might translate to.  Thanks Jordan

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

I calibrated my machines about 10 years ago and have always used Skeinforge
for slicing. Recently I printed some test pieces for checking the fit of my
countersink holes. The test blocks were an arbitrary 100 x 20mm and when
somebody was asking me about calibration I measured the outside to see how
well my settings had held over time. Amazed to find they are within 0.1mm
over 100mm and .02mm under 20mm, so with 0.1% and 0.1mm.

[image: IMG_20210323_212659826.jpg]
[image: IMG_20210323_212544674.jpg]

And I can fit a 2in object in a 2 in hole with soft plastic like ABS, it
will be a press fit. I leave a 0.2mm gap if I want them to fit without
binding. I don't call it a fudge, I call it clearance.

So I just design in OpenSCAD and print things and expect them to be the
size I specify.

On Sun, 25 Jul 2021 at 06:37, Gene Heskett gheskett@shentel.net wrote: