The attached file is a kind of stopper with a hole in it I recently
constructed. To me, this seemed rather simple. However, my admittedly aging
laptop (~2GHz Core 2 Duo, 8GB RAM) struggles to render it. It's been at it
for over 2 hours now and the last try last night crashed after an unknown
amount of time.

So, here's a couple of questions:

• Can anybody who understands more about OpenSCAD's internal workings than I
  do explain why this seemingly simple form makes OpenSCAD struggle so much?

• Is there any better/more efficient way to create that same shape?

• If anybody tries this out and finds their machine copes better, would you
  share the STL with me? I'd really like to print that thing... ;)

Thanks in advance for any help and insights!

Cheers,

Manuel

test.scad http://forum.openscad.org/file/t2095/test.scad

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Using $fa = .1 and $fs = .1 is generating a HUGE amount of vertices.

Maybe try with

$fa = 5;    # minimum angle = 5°
$fs = 0.5;  # minimum segment length = 0.5

ciao,
Torsten.

I would do this as an rotate_extrude .
2D sub system is very fast.

$fa =  0.1;
$fs =  0.5;

r_globus = 130;
r_loch = 11.35;
ueberlapp = 2;
r_zapfen = 2.8;

z=3;

d_deckel = .2;
h_d_deckel = d_deckel*0.5;

h_2=sqrt(pow(r_globus,2)-pow(r_loch+ueberlapp,2));

module hohlkugel(radius,dicke)
{
difference()
{
circle(radius);
circle(radius-dicke);
}
}

module kugelschale(r_kugel,d_kugel,r_scheibe)
{
intersection()
{
hohlkugel(r_kugel,d_kugel);
polygon([[0,0],[r_scheibe,r_kugel],[-r_scheibe,r_kugel]]);
}
}

module test()
{
intersection()
{
union() {
translate([ 0,-z])
difference()
{
square([r_loch,r_globus]);
square( [r_zapfen2,2r_globus],center=true);
}

}
translate([ 0,-h_2]) circle(r=r_globus);

}
intersection()
{ difference()
{
translate([  0,-h_2])
kugelschale(r_globus,d_deckel,(r_loch+ueberlapp)r_globus/h_2);
square( [r_zapfen2,2*r_globus],center=true);

}      translate([ 0,-z])square([r_globus,r_globus]);
}}

rotate_extrude() offset(-h_d_deckel)offset(h_d_deckel) test();

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