Due to recent bot attacks we have changed the sign-up process. If you want to participate in our forum please send a message via our contact form. › Forums › OpenLB › General Topics › Using STL generated from blender › Reply To: Using STL generated from blender November 13, 2022 at 6:08 pm #7024 mathiasKeymaster Two serfaces (i.e. stl triagles) parallel and close to eachother.