State Emergency Service Drones (UGV) - some cool concepts here: adjustable height, multi-level run-flat tires, brush guards, sensor array, structural detailing, storage... well thought out.
The Lyman / Mulier Filament Extruder V5 extrudes filament for use in 3D printers. Features: Stepper Gear Motors LCD control of Ramps for all functions Filament Diameter Sensor Level Winding filament onto Filament Spool. Manual is 60 pages and there are 35 stl part files in the zip folder. BOM for each sub assembly is included with each exploded view of the assembly. Material Cost of about $600. Video Link: https://www.youtube.com/watch?v=vL9zDOdRqBo