I made a custom cube dropper instance, but the cube won't drop. Would someone tell me what I am doing wrong?

Cubedropper.zip

Try using ForceSpawn, not ForceSpawnAtEntityOrigin. That needs a parameter to tell it where you want it to spawn at. Why is the shaft "+" shaped? You probably want to make the angled ramp pieces func_detail, with nodraw behind and below to seal them.