Screws not rendering in OpenSCAD 2021

[LIII-XXII]

The following code (from the tutorials) sometimes does not render the threaded part of the bolts. The console shows a "mesh not closed" error:

use <agentscad/mx-screw.scad>
use <agentscad/mx-thread.scad>


// M6 bolt with 10mm thread length
$fn=50;
screw  = M6();
mxBoltHexagonalThreaded(screw,10);

translate([50, 0, 0])
  mxBoltAllenThreaded(screw,20);

screenshot of the preview:

screenshot of the render:

[LIII-XXII]

after restarting openscad, the error disappeared. I wonder if somehow I had some bad data from a previous render in the cache?

will reopen if I manage to reproduce it

[GillesBouissac]

Hello, i didn't test with OpenSCAD 2021.01, try updating your version, i'm using 2024.03.03