Shock-absorbing heart-shaped lattice structure（PETG）

Unlike springs, it does not rebound, so it efficiently absorbs shocks and vibrations. It is made of PETG and features a curved design to minimize the risk of fatigue fractures caused by bending. However, repeated bending will eventually cause it to break. While using materials like TPU might make it more durable, I haven’t tested that yet.
Please print everything except the handle blocks at both ends using 100% infill PETG.
https://www.youtube.com/shorts/ERLRjWlsr3Q

When I printed this directly in TPU, it simply became a flexible object. Although I designed it with curves intended for PETG, the TPU was too soft and it lost its shape.