Bring hands-on engineering into your K–2 classroom with this no-prep Wobbly Pencil Cup STEM Challenge. Students design, sketch, test, compare, and improve a stable pencil cup holder using simple classroom materials. This early engineering resource helps young learners practice structure and function, stability, criteria, constraints, material properties, data recording, and redesign thinking in a kid-friendly way.This STEM worksheet pack is ideal for science lessons, STEM centers, makerspace act