In case anyone was wondering you can get it to infinitely spawn I pieces by just getting any kind of 3-deep 1-wide well anywhere, and then just keeping that well active, and it'll always give you I pieces:

ϢටलݹઊƗȤڥ௨೯ಽݹॴਉПݹ௨ඥΒधԥටеݹఒௐໃޅݫටДݹ४Οໃࡑ௧پഋݹরΟະࠀ௨ೲໃԔԥඦܯ൫ஜуໄஈமΟະࡊѻ೯लܭЕڠฅɕসඤʈཧࢶكɑݚԥఫІݹஶɈໂɝЩටܬݹ௨ඩໃܭݹقฅ൫௨ටໃݹ௨൜ೡɕরටɓݷಏ୮ฅ൫వට౻ݷԥಀඤݪɷ੬ഫןЬكƬמ௨ඍȣݹ௨ටลஈಏඤɱџбඩແࡁ௨ඨʑעமҼใɕࢳচܘݹ௨ටd