If you have not enabled supports and are printing an object like a pulley
you WILL have a total mess. 3D printer need a surface and an part of the
part that overhangs with just air onder it will not print well as the hot
plastic will just fall out the nozzle.
But that cross hatch pattern looks like support base so it must be enabled.
You can enable support either "from the baseplate up" or "everywhere"
and you need "everywhere" as at to support the top flange.
Yes, removing support is a PIA because on a pulley the teeth will be
completely 100% inside a ring of support material.
For a beginner you picked a hard project. Most people would start by
printing a one-inch cube or a 1/2 inch flat washer. Pulleys have need of
support and have printed threads for the set screw. Both as
"intermediate level" skills. Horizontal threads always have
support inside that needs pin punch (hex key) to remove
I had to modify the pulley design so it could print with minimal support.
Take all the ridges off the outside, make the flange thicker and radius the
inside of the flange
It is also possible to control the support density and pattern.
Getting all this right nly tak seconds if you know to do it. I start in
Fusion and vew thepart from al sides to see if it can be better designed to
reduce the need for support. Then in Cura I try a few suport techniques
and use preview to see where it is going to go. If it looks bad, then
back to Fusion to change an angle or whatever. This is why engineers
like really fast workstatins as design is iterative.
I'll look at a file if you can e-mail it.
On Thu, Jun 4, 2020 at 1:36 PM Gene Heskett <[email protected]> wrote:
> On Thursday 04 June 2020 13:09:10 Chris Albertson wrote:
>
> > Can you save
>
> > 1) the STL file
> yes, I have that, created by openscad
> > 2) the gcode file
> yes, I have that, the .stl file as sliced by cura
> > 3) Then in Cura to File-> and it will save the project file
> Where is this menu? The only write capability I can find in cura is a
> save gcode to file, only after the .stl has been sliced.
>
> > which has
> > all the settings including how you positioned the model on the build
> > plate.
> >
> > I'd look at these fies.
> >
> > But my guess is this is a data error. The gcode file is
> > gettig corrupted or read wrong by the printer. This is rare if using
> > an SD card but if you are feeding the printer via the USB that it is
> > understandable. It looks like data is being dropped, missing g-codes
> > make a mess of the print.
>
> I've pulled up a chair and a cuppa, watching how it makes the 2nd pass at
> a 30 tooth pulley, XL belt style, with one 5mm grub screw and an 8mm
> shaft hole in a 24mm hub OD.
>
> 7mm into the build, its looking like its extending support at about a 50%
> fill (its turned off) coming out of the base of the hub at a 45 degree
> angle outward. Starting at the base.
>
> The grub screw location, and its nut is a 100% fill, the reverse of what
> I could see in openscad or cura, and is extended to a point about 1mm
> past the center of the hub.
>
> Supposed to have an 8mm shaft hole, surrounded by 5mm walls, the central
> hole is 24 or 25mm in diameter, full of air. Except for the post of
> plastic where the grub screw and its nut belongs. I just took a look at
> that, but I expect to see the peak of the hex nut laid up in plastic,
> but at 8.39mm off the bed, it hasn't gotten there yet.
>
> This may be my mistake, it looks good even in cura, including the 8mm
> shaft hole.
>
> TBH the last time I saw this many bugs I was standing over a 10 day old
> road killed deer in mid-August. The only thing missing is the odor.
>
> I'm going to let it finish just to see where else it fscks up, but thats
> the first 24% and 8.39mm off the hot plate. Haven't gotten anywhere
> near the sprocket yet. FWIW, the calibrate with paper sucks, I have it
> gently touching the plate, which isn't that flat, and adhesion is good,
> but dragging a sheet of 22lb thru it is hairball high, no stick at all.
>
> I suspect its doing exactly what the gcode is telling it to. Is there a
> place to send pix to the cura people to look at and tell me I'm an
> ID10T?
>
> >
> > One more thing, It could be that Cura is generating supports inside
> > the screw holes. It might not be infill but rather a support
> >
> > Is the pulley dead-flat? and you are printing it hub extension up.
> > If the model is not in full contact with the plate because perhaps
> > there is a ridge or bump that holds some surface off the plat that
> > this cross hatching is the base of some support materials. Cura uses
> > a cross hatch as the first layer of support material.
> >
> > If is best if the base of everything you print is a flat plane. I
> > can't tell without a look at the files.
> >
> > One more thing, for objects like this try "Gyroid" infill type. It
> > makes a 3D patterns like open-cell foam using intersecting sine waves.
> > About 25% is enough for this part.
> >
> > My guess is "data error" is this is done via USB or if there is a
> > ridge on the pulley it might be suport but suort is printed in X and Y
> > direction not at 45 degrees. But I don't know the camera angle.
> >
> > On Thu, Jun 4, 2020 at 9:24 AM Gene Heskett <[email protected]>
> wrote:
> > > On Thursday 04 June 2020 08:13:53 andy pugh wrote:
> > > > On Thu, 4 Jun 2020 at 12:20, Gene Heskett <[email protected]>
> > > > wrote:
> > > >
> > > > Preview has a camera view angle that takes the image off the
> > > > bottom of
> > > >
> > > > > the screen, long before the magnification has reached a usefull
> > > > > level.
> > > >
> > > > Shift-drag, Ctrl-drag and Alt-Drag all do different things to the
> > > > preview.
> > >
> > > Crazy. But the build in progress is totally screwed, theres a post
> > > of 50% infill where the shaft hole s/b, and the wall around the
> > > shaft is missing! Taking the raft off took most of the infill with
> > > it because there was no solid bottom or top to a 12mm tall hub that
> > > measures 12.5mm tall now. The only conclusion I can reach is that
> > > I've done something to the src file, which I've been doing a save-as
> > > to the modified code before handing it off to the slicer each time.
> > > So go back to the original src and start all over.
> > >
> > > Which I did, but stopped that build when it was obvious it was going
> > > to do the same miss-build again.
> > >
> > > 1. no bottom hub wall
> > > 2. no wall around shaft or nut pocket
> > > 3. nut pocket 100% infilled
> > > 4. middle of whats supposed to be an 8mm shaft infilled
> > > 5. Scan attached for the experts perusal, whats fubared in cura?
> > >
> > > But I think I'll go get the tooth count I need to put the 2nd motor
> > > on the Sheldon's Z, and see if I can find an alu sprocket for that.
> > >
> > > 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>
> > > _______________________________________________
> > > Emc-users mailing list
> > > [email protected]
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
> 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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>
--
Chris Albertson
Redondo Beach, California
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