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The traditional capsules usually roll around and even to the floor or other dirty places, which leads to the unnecessary waste. The process of searching the lost capsules worsens the user’s mood as well. The design of the triangular capsule transforms the shape from cylinder to tri-prism, and increase the friction force via substituting rolling friction with sliding friction to settle the matter. It is environmentally-friendly which can both reduce the waste and boost the user’s mood.