Repair Bot

A walking bot with welder arms. Crafted from glass, a Blank Chip, 2 iron ingots, redstone and a grindstone.

What it does

Repair: every couple of seconds it checks the armour you wear and the items on your hotbar, and mends the most worn one first, about 40 durability points a second at 2 FE per point, while you are within about 6 blocks.
It stops at 10 % battery so it can still get home.
It only mends its owner's gear, never items that cannot break, and never another player's.