---
id: 3295c4f0-6549-46b5-a9f5-cd5e6fa4e901
type: solution
title: "OpenSCAD CSG coplanar face export fix"
tags: [openscad, 3d-printing, csg, fix]
importance: 0.7
confidence: 0.8
created: "2025-12-24T21:02:42.512818+00:00"
updated: "2025-12-24T21:02:42.512818+00:00"
---

When OpenSCAD F6 render shows geometry correctly but STL/3MF export drops features, it's likely coplanar faces confusing CGAL. Fix by adding small epsilon offsets (0.01mm) to geometry start positions to avoid exact coincident surfaces. Export as 3MF instead of STL for better mesh handling.