A disc you place under your bed posts to intercept bedbugs if they choose to move away from the bed and hide. This trap should catch them coming and going. Bedbugs are terrible climbers so the inside of the trench has a steep angle. Feel free to spray insecticide inside the trap as well.

I sincerely hope you never need this but I hope it helps someone.

V1 (removed from download section) Catches nymphs well, I put an adult in the moat and it was able climb out. I will be adjusting the angle and height of the walls in ver 2 today. V2 (never uploaded) made the moat walls more vertical and adjusted points. V3 (never uploaded) made the moat taller and measured the gaps and height at 20mm about 4x the body length of an adult nasty

V4 CURRENT minor adjustment to inside diameter.