Hello, I try to make cylinder or tube shapes using Part, then make Bolt or Simple Group, but always get the error: 17:35:15 <Part> ViewProviderExt.cpp(1267): Cannot compute Inventor representation for the shape of Unnamed#trajectory_line: Bnd_Box is void Seems to happen just with these type of shapes, cube seems to be ok. in simplest form: 1. new file 2. part workbench: create cylinder 3. exploded asssmbly workbench: select cylinder 4. creat bolt group (or simple group) 5. get error It's just not possible with those types or some bug? [code] OS: Windows 10 build 19045 Word size of FreeCAD: 64-bit Version: 0.21.2.33771 (Git) Build type: Release Branch: releases/FreeCAD-0-21 Hash: b9bfa5c5507506e4515816414cd27f4851d00489 Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3 Locale: English/United States (en_US) Installed mods: * ExplodedAssembly [/code] [bndbox.zip](https://github.com/user-attachments/files/17008313/bndbox.zip)