PrintCraft

Printcraft — The Copier                                                                                                   
                                                                                                                            
  Printcraft adds the Copier, a furnace-style machine block that duplicates items instead of smelting them.                 
                                                                                                                            
 How it works:                                                                                                             
 Place any item in the input slot and it stays there forever — it's never consumed. Add fuel, and each burn cycle produces one extra copy of that item in the output slot. Keep feeding it fuel and it keeps printing copies, up to a full stack (64) in the output before it pauses.     

Fuel works exactly like a vanilla furnace — coal, charcoal, lava buckets, blaze rods, and anything else that burns will do. Better fuel doesn't make individual copies faster (each copy always takes the same time), but it burns for longer, so you get more copies before you need to refuel — a lava bucket will run the Copier far longer unattended than a lump of coal.                          

for those using 1.21.1 this is the recipe 

for those using 1.21.9 there is a new recipe and more fuel sources.

new recipe for 26.2: