cura screw up?

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cura screw up?

Gene Heskett
Back again, new printer yadda yadda;

I have this .scad file:
...
// new example, low ratio harmonic drive floating splined belt.
// s/b 30/1 when finished. Amateur at work.
// 12 mm height before scale, no effect below
// size of tooth, all in mm's, no effect below
teeth = 60; // define number  of teeth
arcx = ( 360 / teeth ); // arc of circle per tooth
$fr = 0.000000;
toothdia = (5.9*arcx);
max=53.55;// curiosity
min=49.50;// ditto
total=min+max;//ditto
toothcirc=(total / 3.76);// sets tooth circle at center with tooth
 //overlap at base
height=12; // mm's
echo (14, teeth, arcx, toothdia, toothcirc, $fr) ;  // echo? yes, once
union() {
difference() { // inside smoother
    cylinder(d=53.60, h=12, $fn=90,center=true);//overlap isn't fussy
    cylinder(d=52.70, h=12, $fn=360,center=true);// but inner face is
    }
// for 6 we'll get 60 teeth
for($fr=[ 0: 6 : 359 ]){
rotate([0, 0, $fr]) // works, finally
translate([toothcirc, 0, 0])  // mv x=[$lr + $r1] y,z=0
scale(v= [.100, .100, 1.00]) // might use a small diferential
// here to improve tooth fit by changing the angle.
cylinder(d=toothdia, h=height, $fn=3, center=true); // make
//thick triangle
}
};
...

looks great in openscad preview. Give or take a fraction of a mm for
perfect fit.  But export the .stl into cura, and its fubared on the
build plate.

cura, in additiion to a ton of stringing, and uncounted retractions is
inserting an extra somewhat loose inside layer for about 1/8 of the
circle that is only attached at the joint location of the tooth base
overlap. I have broken 3 of these trying to cut the stringing and this
extra stuff away.

So, what am I doing wrong that confuses cura?

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>
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Re: cura screw up?

lar3ry
Gene Heskett wrote
So, what am I doing wrong that confuses cura?
The cynic in me says "using it".

I don't, so I can't test, but you might want to try changing the inner cylinder to a height of 13, and the cylinder to a height of height-.005.

A preview (F5) will show you why.

Try that on Cura.


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Re: cura screw up?

Terrypin
Annotated screenshot shows both your original and increasing h to 13 in line 19. Made OpenSCAD preview much cleaner, but can't see any significant difference in Cura?



Or higher res here:
https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?raw=1

P.S. I've heard of two cases where Gmail decides my images are spam. Would appreciate feedback of any other cases please, to help me isolate cause.

Terry

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Re: cura screw up?

softfoot

Re spam issue ... is it that it's deciding that there is too much skin tone and therefore "porn" ??

At one place I worked they had such a porn filter - the problem was that marketing (bless their cotton socks) made a point of highlighting business news by sending out scans of cuttings of the Financial Times that tripped the porn filter every time! (the paper used was pink - not sure if still is).

Dave


On 19/06/2021 16:24, Terrypin wrote:
Annotated screenshot shows both your original and increasing h to 13 in line 19. Made OpenSCAD preview much cleaner, but can't see any significant difference in Cura?



Or higher res here:
https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?raw=1

P.S. I've heard of two cases where Gmail decides my images are spam. Would appreciate feedback of any other cases please, to help me isolate cause.

Terry

Sent from the OpenSCAD mailing list archive at Nabble.com.

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Re: cura screw up?

Gene Heskett
In reply to this post by lar3ry
On Saturday 19 June 2021 10:28:16 lar3ry wrote:

> Gene Heskett wrote
>
> > So, what am I doing wrong that confuses cura?
>
> The cynic in me says "using it".

Is there a better one that can still drive the printer over usb?  This is
a linux only farm.  And this is the appimage version of cura 4.9.1.
Among other bitches, it can't see a filename over 16 characters.

> I don't, so I can't test,

What do you use?

> but you might want to try changing the inner
> cylinder to a height of 13, and the cylinder to a height of
> height-.005.
>
> A preview (F5) will show you why.

F5 shows trash all over, doesn't say why, f6 restores the rendered
preview.

Your changes fixed f5, but not cura. The first layer put down still shows
the error. And its continueing layer by layer, up to about 10 layers
now. And I am about to see if a ruby nozzle and carbon fiber PETG will
survive cleaning it up. PLA literally falls apart. No flexibility, and
this part WILL be flexed, about 2mm in a 52mm circle. The armature that
rotates inside it and drives it thru ball bearings is eliptical by 2mm.  
So this toothed belt and the outer bearing races are subject to being
flexed in and out about a mm each way, at up to 2000 rpms.

> Try that on Cura.

I edited the .scad to translate([0,0,6]) it all to be at or above the
plate, then found I was using the "CR-10S" driver when its a "CR-10S pro
V2", but V2 hasn't made it into cura yet so had to settle for a "CR-10S
Pro".

And I think it may be fixed. 2.5 hours will tell the tale. ;o)

But I expect to have switch to a carbon fiber filament for this part in
the long run. Might even have to buy a ruby nozzle smaller than the
default .4mm. That tale has yet to be written.

Thanks Lar3ry.

>
> --
> Sent from: http://forum.openscad.org/


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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Re: cura screw up?

Gene Heskett
In reply to this post by Terrypin
On Saturday 19 June 2021 11:24:23 Terrypin wrote:

> Annotated screenshot shows both your original and increasing h to 13
> in line 19. Made OpenSCAD preview much cleaner, but can't see any
> significant difference in Cura?
>
> <http://forum.openscad.org/file/t3184/Gears-Gene-Cura-Both.jpg>
>
> Or higher res here:
> https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?raw
>=1
> <https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?ra
>w=1>
>
> P.S. I've heard of two cases where Gmail decides my images are spam.
> Would appreciate feedback of any other cases please, to help me
> isolate cause.
>
> Terry
>
See my other post, Terrypin. I think its fixed, the problem never was
visible even in curas previews, only showing up on the build plate. It
was a combo of the wrong driver, and an stl that was vertically centered
with 6mm below the plate and 6mm above.

Now all I am getting to clean up is lots of stringing across the open
spaces.  That will be much easier to clean up.  Now if its the correct
size. That will take another 2 hours to define.
>
Thank you a lot for your efforts.
>
> --
> Sent from: http://forum.openscad.org/


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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Re: cura screw up?

lar3ry
In reply to this post by Gene Heskett
Gene Heskett wrote
> > So, what am I doing wrong that confuses cura?
> The cynic in me says "using it".

Is there a better one that can still drive the printer over usb?  This is
a linux only farm.  And this is the appimage version of cura 4.9.1.
Among other bitches, it can't see a filename over 16 characters.

> I don't, so I can't test,

What do you use?
Before I switched my main PC to Linux, and before I started using Octopi on a Pi 3, I used slic3r and later, Prusa Slicer for slicing, and Repetier-Host for controlling the printer. I tried using Cura early in my 3D experience, back in 2014, and it was absolutely horrible. I see that it has improved a lot, but I am used to the other ones now.

Now I use the same slicers,  but run a Pi 3B. It controls the printer over USB, and I can access it from a browser on either my Windows or Linux PC. I also run Klipper on it, and I may be trying a few other Klipper-like interfaces that look promising.

So I can send sliced gcode files by drag'n'drop using my browser, do all the printer setup, and start the print. I can watch it from my tablet  if I am upstairs.

I highly recommend Octopi.


> but you might want to try changing the inner
> cylinder to a height of 13, and the cylinder to a height of
> height-.005.
> A preview (F5) will show you why.

F5 shows trash all over, doesn't say why, f6 restores the rendered
preview.
The reason it shows trash is that when you preview, any surfaces that are the the same, like the outer cylinder and inner cylinder being exactly the same height, create the sort of shimmering you see.  The difference will still work, but making the height very slightly different solves the visual problem

Your changes fixed f5, but not cura. The first layer put down still shows
the error. And its continueing layer by layer, up to about 10 layers
now. And I am about to see if a ruby nozzle and carbon fiber PETG will
survive cleaning it up. PLA literally falls apart. No flexibility, and
this part WILL be flexed, about 2mm in a 52mm circle. The armature that
rotates inside it and drives it thru ball bearings is eliptical by 2mm.  
So this toothed belt and the outer bearing races are subject to being
flexed in and out about a mm each way, at up to 2000 rpms.
Frankly, I think your problem may be entirely in the printer setup. Temperature, especially on the first layer. Filament feed rate. A partial clog will also cause problems that look like weak prints, as the filament is thinner than it should be.
Does the filled-in first layer look like a proper layer, or is it very thin. If very thin, it could be stringing.

> Try that on Cura.
I edited the .scad to translate([0,0,6]) it all to be at or above the
plate, then found I was using the "CR-10S" driver when its a "CR-10S pro
V2", but V2 hasn't made it into cura yet so had to settle for a "CR-10S
Pro".
And I think it may be fixed. 2.5 hours will tell the tale. ;o)
But I expect to have switch to a carbon fiber filament for this part in
the long run. Might even have to buy a ruby nozzle smaller than the
default .4mm. That tale has yet to be written.
Good luck, Gene.


Sent from the OpenSCAD mailing list archive at Nabble.com.

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Re: cura screw up?

Gene Heskett
In reply to this post by softfoot
On Saturday 19 June 2021 12:15:03 Dave wrote:

> Re spam issue ... is it that it's deciding that there is too much skin
> tone and therefore "porn" ?? At one place I worked they had such a
> porn filter - the problem was that marketing (bless their cotton
> socks) made a point of highlighting business news by sending out scans
> of cuttings of the Financial Times that tripped the porn filter every
> time! (the paper used was pink - not sure if still is).
>
> Dave

gmail's filtration, or failures thereof, is subject to lots of durogatory
discussion. Unfortunately its everyplace on the web EXCEPT on their
support pages.  It is not open for discussion there. I tried it, years
ago, but soon voted with my wallet.  My ISP did too, setting up their
own mail server on a linux box using dovecot. Best thing I can say is it
Just Works. I think thats is what it is supposed to do. :o)

> On 19/06/2021 16:24, Terrypin wrote:
>
>  Annotated screenshot shows both your original and increasing h to 13
> in line 19. Made OpenSCAD preview much cleaner, but can't see any
> significant difference in Cura?
>
>
>
>  Or higher res here:
>
> https://www.dropbox.com/s/qi8xc3v6yo0ee7q/Gears-Gene-Cura-Both.jpg?raw
>=1
>
>  P.S. I've heard of two cases where Gmail decides my images are spam.
> Would appreciate feedback of any other cases please, to help me
> isolate cause.
>
>  Terry
>
>  Sent from the OpenSCAD mailing list archive at Nabble.com.
>
>
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email to [hidden email]


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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Re: cura screw up?

lar3ry
In reply to this post by Gene Heskett
Gene Heskett wrote
See my other post, Terrypin. I think its fixed, the problem never was
visible even in curas previews, only showing up on the build plate. It
was a combo of the wrong driver, and an stl that was vertically centered
with 6mm below the plate and 6mm above.
Check to see if Cura has a "Lie flat" button. Slic3r and Prusa Slicer both have it. That way, it doesn't matter where the stl thinks it is vertically, or even it it's tilted. It will plop it down to Z=0, and show you what corrections it made when you look at the 'Rotate" setting.

Sent from the OpenSCAD mailing list archive at Nabble.com.

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Re: cura screw up?

Gene Heskett
In reply to this post by lar3ry
On Saturday 19 June 2021 13:26:50 lar3ry wrote:

> Gene Heskett wrote
>
> >> > So, what am I doing wrong that confuses cura?
> >>
> >> The cynic in me says "using it".
> >
> > Is there a better one that can still drive the printer over usb?
> > This is a linux only farm.  And this is the appimage version of cura
> > 4.9.1. Among other bitches, it can't see a filename over 16
> > characters.
> >
> >> I don't, so I can't test,
> >
> > What do you use?
>
> Before I switched my main PC to Linux, and before I started using
> Octopi on a Pi 3, I used slic3r and later, Prusa Slicer for slicing,
> and Repetier-Host for controlling the printer. I tried using Cura
> early in my 3D experience, back in 2014, and it was absolutely
> horrible. I see that it has improved a lot, but I am used to the other
> ones now.
>
> Now I use the same slicers,  but run a Pi 3B. It controls the printer
> over USB, and I can access it from a browser on either my Windows or
> Linux PC. I also run Klipper on it, and I may be trying a few other
> Klipper-like interfaces that look promising.
>
> So I can send sliced gcode files by drag'n'drop using my browser, do
> all the printer setup, and start the print. I can watch it from my
> tablet  if I am upstairs.
>
> I highly recommend Octopi.
>
> >> but you might want to try changing the inner
> >> cylinder to a height of 13, and the cylinder to a height of
> >> height-.005.
> >> A preview (F5) will show you why.
> >
> > F5 shows trash all over, doesn't say why, f6 restores the rendered
> > preview.
>
> The reason it shows trash is that when you preview, any surfaces that
> are the the same, like the outer cylinder and inner cylinder being
> exactly the same height, create the sort of shimmering you see.  The
> difference will still work, but making the height very slightly
> different solves the visual problem
>
> > Your changes fixed f5, but not cura. The first layer put down still
> > shows the error. And its continueing layer by layer, up to about 10
> > layers now. And I am about to see if a ruby nozzle and carbon fiber
> > PETG will survive cleaning it up. PLA literally falls apart. No
> > flexibility, and this part WILL be flexed, about 2mm in a 52mm
> > circle. The armature that rotates inside it and drives it thru ball
> > bearings is eliptical by 2mm. So this toothed belt and the outer
> > bearing races are subject to being flexed in and out about a mm each
> > way, at up to 2000 rpms.
>
> Frankly, I think your problem may be entirely in the printer setup.
> Temperature, especially on the first layer. Filament feed rate. A
> partial clog will also cause problems that look like weak prints, as
> the filament is thinner than it should be.
> Does the filled-in first layer look like a proper layer, or is it very
> thin. If very thin, it could be stringing.
>
This printer, a Creality CR-10S Pro V2, has BLTouch, samples a 5x5 matrix
all over the bed. I spent 3 or 4 hours yesterday fine tuning that so the
autotune didn't have more than 1/2 a mm to correct, and if you add a
printer that has that, it runs thru that to refresh that mapping before
it does the first print.  So bed leveling is pretty good.  And it sticks
hard, making you let it cool before trying to lift the print.  The 1st
layer looks good, and it just keeps on truckin now that I'm closer to
the correct driver.

Except for the stringing, this print in progress looks (queue the Tony
the tiger voice) great.

> >> Try that on Cura.
> >
> > I edited the .scad to translate([0,0,6]) it all to be at or above
> > the plate, then found I was using the "CR-10S" driver when its a
> > "CR-10S pro V2", but V2 hasn't made it into cura yet so had to
> > settle for a "CR-10S Pro".
> > And I think it may be fixed. 2.5 hours will tell the tale. ;o)
> > But I expect to have switch to a carbon fiber filament for this part
> > in the long run. Might even have to buy a ruby nozzle smaller than
> > the default .4mm. That tale has yet to be written.
>
> Good luck, Gene.
>
Thank you.
>
>
>
> --
> Sent from: http://forum.openscad.org/


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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Re: cura screw up?

Gene Heskett
In reply to this post by lar3ry
On Saturday 19 June 2021 13:37:02 lar3ry wrote:

> Gene Heskett wrote
>
> > See my other post, Terrypin. I think its fixed, the problem never
> > was visible even in curas previews, only showing up on the build
> > plate. It was a combo of the wrong driver, and an stl that was
> > vertically centered with 6mm below the plate and 6mm above.
>
> Check to see if Cura has a "Lie flat" button. Slic3r and Prusa Slicer
> both have it. That way, it doesn't matter where the stl thinks it is
> vertically, or even it it's tilted. It will plop it down to Z=0, and
> show you what corrections it made when you look at the 'Rotate"
> setting.
>
Cura has all that. And the next print that was in progress, cleaned up of
all the stringing, about .1mm too big. Pretty good for a SWAG.  Making
the next one with 30% more infill in gyroid pattern, .1mm smaller, which
will also improve the wall strength a teeny amount.  Then it might be
time to rig it on the motor, add some plastic lube on the bb's and drive
it for a day to see what if anything breaks.  Added a mm to the
retraction got rid of most of the stringing. At 2mm high its a whole lot
cleaner a print. If it doesn't plug up. It is still using retractions by
the thousands.  And I still don't have a side fan, its hot enough to
burn a finger but not running. I've sent a msg to the vendor but no
reply as yet. PETG doesn't want it, but this is the starter PLA.

Thanks lar3ry.

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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Re: cura screw up?

Terrypin
In reply to this post by softfoot
Thanks, that’s one possible cause I’d never have dreamt of! Plausible reasoning though.

However, that image was received by several here. Highlighting difficulty of gathering practical evidence. Bit like “Can you hear me at the back of the class?”


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Re: cura screw up?

Gene Heskett
On Saturday 19 June 2021 17:08:04 Terrypin wrote:

> Thanks, that’s one possible cause I’d never have dreamt of! Plausible
> reasoning though.
>
> However, that image was received by several here. Highlighting
> difficulty of gathering practical evidence. Bit like “Can you hear me
> at the back of the class?”

Well, as an old (86) Iowa born farm kid, we'd call that question about as
useless as the teats on a boar hog. :)  You will either get a yes
because they did hear you, or silence because they didn't.

>
> --
> Sent from: http://forum.openscad.org/


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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