Say I have a file with the lines: use <pygcodepreview.scad>; generategcode = true; a = 300; gcomment(str(a)); and pygcodepreview.scad is loaded from a library directory and contains: module gcomment(comment) {if (generategcode == true) { echo("(",comment,")");}} Should that work? If it should, why do I get the error: Documents/OpenSCAD/libraries/pygcodepreview.scad, line 4 WARNING: Ignoring unknown variable 'generategcode' in file ../Documents/OpenSCAD/libraries/pygcodepreview.scad, line 8 I thought I had used such constructs in the past? Did something change? Or am I getting this wrong somehow?(I'm using the nightly build: https://files.openscad.org/snapshots/OpenSCAD-2023.09.10-x86-64-Installer.exe )William