Rendering issue with latest openscad

[curious aardvark]

ah - yes I usually do the second thing. haven't bothered for this script, so that probably make sense.
And I rendered, exported (both with error message) and printed a 5x5 without any issues - so basically I think I can just ignore the message.
It is actually creating a printable and manifold model.

Cheers for the help Roxy, appreciated :-)

Going to try for a 30x20 grid. 600 pins and around 15x10cm
no idea how long it'll take to render - even at the low facet numbers.

that's the main thing that's missing from this version of openscad - it used to tell you how long a render had taken. It doesn't any more. I used to find that really useful.