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The cube is indeed supposed to bounce around as you get prepared for the funnel. I haven't found the best way to hold the bouncy cube in place so you can portal the excursion funnel to catch it.
Thank you.
https://rctaddict.adryheat.net/try.zip
Extract the *.dem file inside the *.zip file to:
[Steam installation folder]\SteamApps\common\Portal 2\portal2
To play the demo, you need to be subscribed to the map and have the console enabled. More info how to play *.dem files:
https://developer.valvesoftware.com/wiki/Demo_Recording_Tools
Now I was able to complete the chamber and I gotta say that it was fun! Figuring out the way to get the cube not only out of the glass cave but also clean. Very good work! Thumbs up!!!
Sounds about right because p0rtalmaster had similar concerns. It's the correct move.
Always trying to solve things in a more complicated fashion. :P
One more sheet of glass should do the trick.
You solved it correctly.
Here is my demo [www.dropbox.com], since we need to talk a bit about "rules", I'd like to know if it's the intended way. Cya in forum!