I am trying to modify a peg hook (https://www.thingiverse.com/thing:53229) to
make it stronger. I had one break after a couple of years hanging a damp
towel on it. I tried using the BOSL library, shapes.scad,
thinning_triangle(), then I tried right_triangle(), and finally, my own
triangle using a hull() of three spheres.

I can preview the object, but I can only render one of the parts. I choose
which part using the "!" character, and I can render the hook, OR the brace,
but if I try to render both, I only get the brace. Ideas?

$fn=36;

union() {
import("PegHook.stl");
brace();
}

module brace() {
hull() {
translate([18,8.5,1.505])
sphere(d=3);
translate([18,8.5,22.5])
sphere(d=3);
translate([43,8.5,1.505])
sphere(d=3);
}
}

PegHook.stl http://forum.openscad.org/file/t2121/PegHook.stl

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It means the .stl file has bad geometry.

Self Intersections:
http://forum.openscad.org/file/t359/Capture_peghook.jpg

Those red bits, that top is not glued on properly...

Why not build your own hook in OpenSCAD?

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