Sleeping / Awake Door Sign

This is a simple sleeping/awake door sign that you can 3D print. Stick it on your room door with a bit of Blu Tack or sticky tack. Slide the cover to show others whether you're sleeping and shouldn't be disturbed or if you're awake. I used to do this with a piece of paper and a sticky note, so I thought it was time to design something more practical. No ABS is required; it's a quick print, and the sliding mechanism's 45-degree angles mean no supports are needed.