{"blueprint":{"id":221,"title":"Scalable passive smelter","description":"Completely passive gold (or copper) smelter, works only off residual lava heat, requiring no lava refills after the initial one.\nCan (and should) be scaled to arbitrary throughput, which is quadratic with height.\nSome gold will stick to slopes during operation - this is normal, it acts as coating.\nAlso features a channel for easy initial filling, just copy-paste the funnel into the center, fill it with lava, remove when done.","descriptionTruncated":false,"tags":["smelter","passive","prefabs"],"image":"","thumbnailPng":"/bp-images/thumbnail-221.png","author":"mr_accident","status":"approved","source":"public","createdAt":"2026-10-01 12:29:40","bpLength":12255,"format":"v2","copyCount":13,"importCount":1,"highlighted":false,"recentCopies":7}}