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Portal 2: Thinking With More Than Portals, Testchamber 18

Walkthrough (part 1):
-Press the switch to dispense a cube, which will keep falling into goo.
-Walk through the first door, which is open, and the fizzler.
-Shoot a blue portal on the excursion funnel and an orange one on the white surface next to you. Get above the gap to the island with the fizzler.
-Go through the fizzler, shoot a blue portal on the wall next to the falling cubes and stand on top of the stairs. Shoot an orange portal on the excursion funnel.
-When the cube reached your island, touch the fizzler to clear both portals.
-Place the cube on the button. It opens the second door, closes the first one and reverses the color of the funnel. Walk through the fizzler.
-Shoot an orange portal on the reversed funnel and a blue one on the wall at the other side of the goo pit. Ride the reversed funnel back home.

Walkthrough (part 2):
-Walk through the second open door and shoot a blue portal on the wall next to the cube dropper. The funnel will take the cube away from the button.
-Proceed through the first door, which has opened. Shoot an orange portal on the white wall.
-Press the switch to release a new cube, which will keep falling into goo.
-Catch one of these cubes through the portal and take it over to the final button.
-Proceed to the Chamberlock.