Dust collector elbow - 4"

I needed a 90 degree elbow for my drum sander, and didn't feel like "just buying one" :-)

The OpenSCAD file defines the assembled elbow, and there are various options at the bottom for which portion (top, bottom, all, test sections) to export. The elbow is designed for a 4" dust collector port - it clamps on the sander's port and has a "thread" to grip the hose. The two parts are printed separately (it's big ;) and bolted together with #6 nuts and bolts. The clamp uses a #10 bolt and must