New to LBM and OpenLB? Attend our upcoming one-week hands-on Spring School in Marseille/France from 19.05.2025 – 23.05.2025. OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › STL File not valid › Reply To: STL File not valid April 13, 2020 at 12:17 pm #4923 sthavishthaParticipant A small mistake in my earlier message : I meant the folder /examples/laminar/cylinder3d/