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 3:28 pm #7023 eaxebxParticipant Hi Mathias, what’s a double layer in openlb terminology?