How do I stop green blocks wont fall but purple will in one tray. Green blocks keep coming into our purple block tray and is interfering with our driver skills. Any ideas would be helpful. Thank You!
Hi Tigerlion, welcome to the forum.
Can you post a picture of your robot please?
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photos would deeply help. One photo is worth a thousand words.
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No matter how well your passive filter is, there is always a chance a green block can get up onto the purple tray. Murphy’s Law. So I would say if you got your filter as best as possible, a good solution is to solve the issue of what to do when the green block is on the purple tray. Wouldn’t it be nice if the green block can fall back down into the green tray below? Hint. 
I hope that helps.
Cheers.
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Thanks that really helps 
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Yeah, if you look at a old vid of my robot in the link below, the greens fall through as a safety filter.
