Marius, here is another case of expert gone bad. 2015.02.05.

Netfabb output
http://forum.openscad.org/file/n11636/degenerate2.jpg

STL file attached.
Ryobi_Blower_endBit_-_example.stl
http://forum.openscad.org/file/n11636/Ryobi_Blower_endBit_-_example.stl

SCAD code

// Make a smalller tip for the Ryobi Blower. Basis for other end shapes.
// The eliptical end of the Ryobi Blower exhuast tube.

s=0.01;

module ellipseXY(x,y) {
resize([x,y])
cylinder(h=0.01,d=100);
}

module ellipseXYZ(x,y,z) {
hull() {
ellipseXY(x,y);
translate([0,0,z-0.01])
ellipseXY(x,y);
}
}

module ellipseTapered(e1,e2,h,offset=[0,0,0],angle=[0,0,0]) {
echo(e1,e2,h,offset,angle);
hull() {
ellipseXY(e1.x,e1.y);
translate([offset.x,offset.y,h-0.01])
rotate(angle)
ellipseXY(e2.x,e2.y);
}
}

module ellipseTaperedHollow(e1,e2,h,thick=3,offset=[0,0,0],angle=[0,0,0]) {
t=[thick2,thick2];
difference() {
ellipseTapered(e1+t,e2+t,h,offset,angle);
translate([0,0,-s])
ellipseTapered(e1,e2,h+s*2,offset,angle);
}
}

rotate([120,0,0]) {
ellipseTaperedHollow([64,36],[55,25],h=70,thick=2.1);
translate([0,0,70-s])

ellipseTaperedHollow([55,25],[80,15],h=40,thick=2.1,offset=[0,20,0],angle=[-20,0,0]);
}

Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :) Inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”  Fight it! http://www.ourfairdeal.org/

View this message in context: http://forum.openscad.org/Another-degenerated-faces-holes-tp11636.html
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With the RollTopBoxBase I emailed you, I get:

Total rendering time: 0 hours, 0 minutes, 0 seconds
Top level object is a 3D object:
Simple:        no
Vertices:      52
Halfedges:    158
Edges:          79
Halffacets:    60
Facets:        30
Volumes:        2
WARNING: Object may not be a valid 2-manifold and may need repair!
Rendering finished.
WARNING: Object may not be a valid 2-manifold and may need repair! See
http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/STL_Import_and_Export
WARNING: Exported object may not be a valid 2-manifold and may need repair
STL export finished.

But the exported stl passes Netfabb tests.

Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :) Inclusion of works of previous authors is not included in the above.

The TPP is no simple “trade agreement.”  Fight it! http://www.ourfairdeal.org/

View this message in context: http://forum.openscad.org/Another-degenerated-faces-holes-tp11636p11685.html
Sent from the OpenSCAD mailing list archive at Nabble.com.