Hi

I often want to remix work by others. This usually relates to moved fixings
and openings. I usually heal the original opening and then create a new one
to suit my needs. To do this I usually import the original stl and then
create a plug, union() the two together and then finally make the new hole
using difference().

I am trying to do this with an object from Thingiverse:
http://www.thingiverse.com/thing:588121
http://www.thingiverse.com/thing:588121

Here is my code that will not render correctly:

*$fn=60;

importOnly();

module importOnly(){
union(){
#cylinder(h=30.2, d=6);
translate([-100.55,-146.85,0])
import("Launchpad_Core_Rounded.stl", convexity=10);
}
}
*

What I get is just the cylinder that could be created with just this:

*cylinder(h=30.2, d=6);
*

I have tried using utilities that convert the STL to an OpenSCAD polygon,
such as:

http://jsfiddle.net/Riham/yzvGD/embedded/result/
http://jsfiddle.net/Riham/yzvGD/embedded/result/

I have the same issue either way, any ideas why this will not work?

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With my system the import has no problem. Try to update OpenSCAD (I am using
2016.01)

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On my system it will Preview but the STL won't render using your code.
I get this error:

ERROR: CGAL error in CGAL_Nef_polyhedron3(): CGAL ERROR: assertion
violation! Expr: pe_prev->is_border() ||
!internal::Plane_constructor::get_plane(pe_prev->facet(),pe_prev->facet()->plane()).is_degenerate()
File:
/Users/kintel/code/OpenSCAD/openscad/../libraries/install/include/CGAL/Nef_3/polyhedron_3_to_nef_3.h
Line: 251

Strangely if I simply import the object by opening it with scad it creates a
new file with one line:

import("/Users/macdarren/Downloads/Launchpad_Core_Rounded.stl");

This is will both preview and render fine...

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For grins I ran the original STL through Netfabb,
now your code seems to both preview and render fine using the 'fixed' model.

Your fill plug shows as very slightly taller than the original surface of
the model.  It did this on the earlier prefixed model in the preview to so
probably not the result of anything in the repair process.

My guess something odd about the STL file when openscad tried to merge the
plug into the shape.

https://modelrepair.azurewebsites.net

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Thanks for all the replies, I will repair the original as advised and move
on. I think I am running one of the nightly builds at present so I will also
update.

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