Assemble instruction is in my youtube channel https://youtu.be/xnrzO_mabic Caution: Keep it in pop-up mode, when it is not in play. The 3d printed spring will lose its elasticity. The parts are designed and tested to fit each other, however the tolerance is depends on a 3d-printer's condition. Please remove the supports completely. May need a sandpaper or cutter while assemble the parts.