We ran out of stock a couple days ago, but I have more boards on order. I did not expect to run out so quickly. They should be available in April. Here is a photo of what I hope to be getting soon - a batch of boards ready to test.
We are moving the Objects with Intelligence store to this site (on Weebly) in order to save our customers from an additional fee that is coming to the existing web store platform (Storenvy). The new store will reopen in September, with the arrival of a new batch of product. Thank you for your patience.
Hackaday provides a good description about how the filament sensor works. The eyeball people are a little creepy though...
Check out the new FILAFAB winder on Kickstarter. Edward Clifford has incorporated the filament sensor into his offering to control winding speed based on filament diameter.