A few months ago I splurged on a 3D printer and have been using it to make replacement parts for the pool & yard (and anything else I can think of). Here are a couple of things I've made so far. These are all available free for download if you want to make them too.
Pool Pole Friction Ring
Hayward Super Pump Drain Plug p/n SPX1700FG
Diving Board Nut Cover
Shower Hose to Garden Spigot adapter