Spool Storage Rack

My latest skirmish in the never-ending battle with filament spool encroachment. These racks provide excellent storage density, pretty much doubling what you can get vs a shelf of the same depth, and they look kinda cool, too.

The shelving was bought at Lowe's, it's their "Style Selection" brand of heavy-duty double-row rails and brackets. The brackets are formed with a hollow slot facing upwards, into which the tangs on the bottom of the printed parts fit. The pipe is standard 1/2-inch black iron plumbing pipe. I bought 72-inch lengths and cut them in half for 36-inch racks. Galvanized would be fine, too, but it's twice the price of black iron.

The rear pipe holder has an extended tang which backs up against the shelving rail. The front holder doesn't have this, but you could print spacers to go between the front and rear holders to prevent the front ones from sliding backwards if necessary; so far it doesn't seem urgently needed.

If you want to get really crazy you could prob