Get swinging with this handy plastic hinge, attach it to your 20mm extrusion and you can have parts that swing open 180 degrees. Using our button screws, the bumpy heads make it close around ~170 degrees, you can substitute countersink screws if you want a full 180.

You'll also want to get some 10mm long screws to attach it!

Plastic Hinge for 20x20 Aluminum Extrusion (8:30)