I see lots of posts online with similar issues, but the solutions I see are about bugged older versions or one mention of an implicit "union" when objects are rendered one after another.  To get around that, I put the objects in separate modules and it still does it.   This is part of a larger crude Christmas tree type design.  I set up a thing to convert the  raw Earth2.io "holobuilding" data to OpenSCAD to generate a 3D model outside of Earth2.io.   Someone designed a Christmas tree type thing and it was skipping some of the "branches".  I cut down the code so it's just the center trunk/pole and one branch that disappears when both are rendered. Both show up in preview, but not render. I feel like this question is asked a ton, but again.. didn't see any answers that seemed to help my situation.   I know it's going to be "something stupid" (tm) so forgive my OpenSCAD ignorance. Thanks in advance. -Trevor Version: OpenSCAD version 2021.01  Code: one();two(); module one() {    // stick    echo("Starting ONE");    translate([0, 0, 0])    linear_extrude(height=16)    polygon(points= [[0, 0],[-0.250000011875, -0.25000000096],[0, -0.50000000101],[0.24999999732, -0.25000000096],[0, 0]]);    echo("Finishing ONE");} module two() {    echo("objpoints TWO start");    // small one    obj_points1 =[[-1.750000003085, -1.500000001215],[-0.250000011875, -1.000000000205],[-0.500000009195, -1.250000001165],[-0.250000011875, -1.000000000205],[0, -1.000000000205],[0, -1.750000000355],[0.24999999732, -1.250000001165],[0.24999999732, -1.750000000355],[0.24999999732, -1.000000000205],[0.24999999732, -1.250000001165],[0.24999999732, -1.000000000205],[0.999999996565, -1.000000000205],[1.24999999389, -1.250000001165],[0.999999996565, -1.000000000205],[1.74999999581, -1.250000001165],[1.49999999121, -1.250000001165],[0.999999996565, -1.000000000205],[1.24999999389, -1.000000000205],[0.999999996565, -0.750000000155],[0.749999999245, -0.50000000101],[0.999999996565, -0.50000000101],[1.74999999581, -0.50000000101],[1.24999999389, -0.25000000096],[1.74999999581, 0],[0.999999996565, -0.25000000096],[1.49999999121, 0],[0.749999999245, -0.25000000096],[0.749999999245, -0.25000000096],[0.999999996565, 0.24999999914],[0.999999996565, 0.49999999919],[1.24999999389, 0.749999999245],[0.999999996565, 0.49999999919],[1.24999999389, 0.999999999295],[0.24999999732, 0.24999999914],[0.499999994645, 1.249999999345],[0.24999999732, 0.999999999295],[0.24999999732, 1.249999999345],[0.24999999732, 0.49999999919],[0.24999999732, 0.49999999919],[0, 0.749999999245],[0, 0.24999999914],[0, 0.24999999914],[-0.75000000652, 1.249999999345],[-0.250000011875, 0.49999999919],[-0.500000009195, 0.49999999919],[-0.75000000652, 0.999999999295],[-0.75000000652, 0.749999999245],[-0.75000000652, 0.749999999245],[-0.75000000652, 0.49999999919],[-0.500000009195, 0.49999999919],[-0.75000000652, 0.49999999919],[-0.500000009195, 0.24999999914],[-0.250000011875, 0],[-0.500000009195, 0],[-1.500000005765, 0.24999999914],[-0.75000000652, 0],[-0.75000000652, 0],[-1.00000000384, 0],[-0.75000000652, -0.25000000096],[-1.500000005765, -0.50000000101],[-0.500000009195, -0.50000000101],[-1.500000005765, -1.000000000205],[-0.75000000652, -0.750000000155],[-1.750000003085, -1.500000001215],[-0.250000011875, -0.25000000096],[0, 0],[0.24999999732, -0.25000000096],[0, -0.50000000101],[-0.250000011875, -0.25000000096]];    echo("objpoints TWO end");    echo("objpaths TWO start");    obj_paths1 =[[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63]];    echo("objpaths TWO end");    echo("Starting TWO");    // FAILS    translate([0, 0, 2])    linear_extrude(height=0.2)    polygon(obj_points1, obj_paths1);    echo("Finishing TWO");} Log results on Render: Parsing design (AST generation)... Saved backup file: C:/Users/blkgr/Documents/OpenSCAD/backups/unsaved-backup-hrNNKeVd.scad Compiling design (CSG Tree generation)... ECHO: "Starting ONE" ECHO: "Finishing ONE" ECHO: "objpoints TWO start" ECHO: "objpoints TWO end" ECHO: "objpaths TWO start" ECHO: "objpaths TWO end" ECHO: "Starting TWO" ECHO: "Finishing TWO" Rendering Polygon Mesh using CGAL... Geometries in cache: 59 Geometry cache size in bytes: 602280 CGAL Polyhedrons in cache: 11 CGAL cache size in bytes: 3095648 Total rendering time: 0:00:00.047 Top level object is a 3D object: Simple: yes Vertices: 8 Halfedges: 24 Edges: 12 Halffacets: 12 Facets: 6 Volumes: 2 Rendering finished.