Why commercial lifters dont have this?

Working on built in router lifter exhaust system, final design comes next week with new design lock and vacuum pipe connector To download 3d files check: Instagram: Patreon page: Tools: Drill Guide: Thread inserts tool: Multifunctional bench: PVC Shelves: Router Lifter 2.0: 3d printers used : Snapmaker 2.0: Artillery Sidewinder X2: FLsun Super Racer (SR)printer: Camera gear: Camera: Camera lens: Second monitor: Microphone: Lights: #shorts #diy #woodworking