I have accidentally made crystal clear ice in one of these and it wasn't boiled and it was from the tap. I have always wondered how that happened. Again, I have tried boiling the water, but it didn't do what I wanted close enough. I have NOT tried boiling the water in the plastic tray or with plastic wrap on it. I didn't think that plastic wrap was not air permeable. I will try to use these sphere ice cube trays I have and boil the water in the microwave and cover it in plastic wrap. I did try to boil water, pour it in these trays, and I used a bar clamp to cinch the mold between two flat glass plates. I tried to make it airtight. Then, I froze that. It got a LITTLE clear, but not enough. How close could I get with this? My question is...if it was YOU trying to make a solid sphere of ice that is as clear as possible, what would you do? Efficiency and utility aside. I was this purely for aesthetic purposes to impress my friends when we drink.
EDIT: I'm still willing to pay for something like this. A glass tray for ice that will allow me to microwave water and boil it safely, then with smooth edges that I can wrap plastic wrap around or clamp a rubber board on top of for freezing. If there is no top to the ice cube tray, I would imagine that glass wouldn't have an issue anymore and I wouldn't be worried about melting plastic or anything while boiling the water.
Just buy this, boil the water before you freeze, or use distilled, and save yourselves some money :)
Amazon has a set of 2 2.5" ice sphere molds for $10.99. How is this kickstarter necessary?