ping-pong gate 3d model

Design a VERY SIMPLE functional 3D-printable ping-pong ball release gate for a children's science experiment. The design must be extremely simple, safe, durable, and easy for children to operate. MAIN REQUIREMENTS: - Release 5 ping-pong balls simultaneously. - Ping-pong ball diameter: approximately 40 mm. - Overall release gate width: approximately 600 mm. - The five balls are positioned in five parallel lanes. - One single physical barrier must hold all five balls. - Do NOT use gears. - Do NOT use a rotating shaft. - Do NOT use five separate gates. - Do NOT use complicated mechanisms. - Do NOT use motors. - Prefer NO springs. SIMPLE RELEASE MECHANISM: Use one long horizontal sliding or lifting barrier. Normal position: - The barrier blocks all five ping-pong balls. Release: - A child simply lifts the barrier upward using a large handle. - When the barrier is lifted, all five balls are released simultaneously. - The barrier should remain easy to remove and reset manually. DESIGN: