Hello

i am trying to design my own spool holder for my 3D printer (i know there
are more original stuff to do, yet, i found nothing directly usable, so...)

i have put the actual state into https://github.com/nohkumado/spulenhalter

at the moment it is quite coarse, i am still a beginner with openscad, the
rim is not as i want it to be, it still protrudes a bit, the encroachings
need bevelling to be more gentle to the touch (well sandpaper is your
friend... but if i could do without...)

i read about the different bevel libraries, but only found ones that work on
straight lines, and mine are (should be) curved (my polygons are still
rough....) i found some examples on curved surfaces, but the stuff presented
there exceeded by far my mathematical prowesses.....

so if someone has some tips, or even maybe could look into the knob:

https://github.com/nohkumado/spulenhalter/blob/master/knauf.scad

and make it more smooth, would earn my neverending thankfullness!

thanks in advance

Bruno

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

The easiest solution:

minkowski()
{
knauf();
sphere(3);
}

</file/t887/Knauf.png>

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

hello again!

well :( didn't work (as sayd code is in
https://github.com/nohkumado/spulenhalter)

i added the minkovsky transform to the final stage, and the whole thing
bites the dust with a
Parsing design (AST generation)...
Compiling design (CSG Tree generation)...
Rendering Polygon Mesh using CGAL...
ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: e_below != SHalfedge_handle() File:
/usr/include/CGAL/Nef_3/SNC_FM_decorator.h Line: 427
Geometries in cache: 143
Geometry cache size in bytes: 1374856
CGAL Polyhedrons in cache: 24
CGAL cache size in bytes: 67098656
Total rendering time: 0 hours, 1 minutes, 24 seconds
Rendering finished.

that'a in the file
https://github.com/nohkumado/spulenhalter/blob/master/Spulenhalterschraube.scad
that calls https://github.com/nohkumado/spulenhalter/blob/master/knauf.scad
and adds the thread...

without the minkovsky transform, no problem, preview and compile work, with
the transform, the preview is ok, but the compile fails :'( what'ß going
wrong? anyway to fix this?

thanks!
Bruno

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ok.....
while trying to print the other part, that compiled..... i noticed that the
insert for the bearing was missing....
i commented the difference in
https://github.com/nohkumado/spulenhalter/blob/master/Spulenhalterschraube.scad
to make the insert visible, its there, and it should remove its slice from
the minkovsky transformed handle, shouldn't it?

while it does work on the other end of the holder, it doesn't work on the
handle :(
that makes it really strange for me....

any light welcome!

Bruno

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