Home / Browse / @sfs_engineer sfs_engineer (@sfs_engineer) Spaceflight Simulator blueprints uploaded by sfs_engineer on SFS Blueprints. 4 public blueprints. Blueprints by sfs_engineerInterim Cryogenic Propulsion Stage (No DLC Pack)Mars Exploration Rover (No DLC Pack)ISS Satellite (No DLC Pack + BP Edited)Communications Sattelite (No DLC Pack) Browse all SFS blueprints