Bristlebot: Make a kid friendly robot for under $10

Picked one by one from a mixed channel. Transcript check: both title readers certain; 4 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include only explicit tutorials, step-by-step guides, assembly/build instructions and how-to lessons (e.g. beginner's guides, slicing/design technique, firmware/CAD how-tos). Exclude all reviews, first impressions, product tests, listicles, series progress episodes, supercuts and channel news.