Re: ORGANICS SUCK!!!! (A Tribute Thread)
I think we did see the cartridge when he was building the web shooters in his basement, in the same scene when the webbing blew up in his face. Also, we get glimpses at the shooter itself like when he does a hand stand on the building. I think there is enough information for us to assume that there are triggers on the web shooters. Although Peter didn't invent the formula for the webbing, he still created the web shooter from watches, which still shows that Peter is a very intelligent kid.