Motion edit prompt

Begin by masking the teddy bear completely so only the printer rail, carriage, and pointed pen tip are visible. Keep the carriage attached to the horizontal rail, and move the whole rail-and-carriage assembly straight downward from its upper resting position to the lower print area. Once it reaches the bottom, move the assembly back upward smoothly while the carriage rapidly slides side to side along the rail with eased reversals, starting by moving to the right, then alternating left and right for 15 horizontal slides total: 8 rightward slides and 7 leftward slides, with the last rightward slide returning to center. The rail returns to where it sits in the provided SVG before the carriage finishes its final rightward return to center. Reveal the teddy bear in sixteen thick horizontal scan bands from bottom to top, with each band appearing gradually across its width, synchronized with the pen tip: the feet appear first, then the lower body and arms, then the face and head, and finally the ears and top of the head. Already revealed parts remain fixed in place, while the unrevealed upper portion stays hidden; as the bear appears over the pen, it occludes the lower pointed tip so the pen ends as a short connector above the completed bear. Finish with the carriage centered again at the top and the full teddy bear visible.