Printer Brand: RepRap Printer: Prusa i3 Rafts: No Supports: No Resolution: .2, .3, or .4mm Infill: 20% Notes: I printed in PLA just because that is what I had on hand. The parts are not subjected to any heat, so just about any materials would work. Post-Printing After printing, remove support columns from extruder body. A pliers or scissors should do just fine. Bill Of Materials All the parts needed to build this open source clay extruder: -Printed extruder -Printed Base -Nema 17 stepper motor (I purchased mine from Lulzbot: http://ow.ly/ZsSt5 , $13.95) Aluminum coupler - 5mm on both ends. (I purchased mine from Inventables: http://ow.ly/ZsSMe , $6.95) -1/2" Flat faucet washer. I purchased a pack of 10 at Home Depot for $1.69, http://ow.ly/ZsTrs (the outside dimension of this rubber washer is 3/4", the inside diameter is 1/8". It is 1/8" thick. (Why is this called a 1/2" washer?)) -Deck Screw 1/4" x 4". I bought mine at a local Ace Hardware for $1.60. I used a "Timber-Tite" brand - here's a pack of 50 at Amazon, http://ow.ly/ZsUqC . I'd imagine any similar screw would work, perhaps better. -Cake decorating tips. This is the "nozzle" of the print head. There are numerous shapes and sizes available, all of which could work potentially. Two brands which fit this extruder are Ateco http://ow.ly/ZsV34 , and PME http://ow.ly/ZsV8V . The Ateco ones are about $1 each, the PME are about $6 each. Cake decorating Pros rave about the more expensive PME tips http://ow.ly/ZsVdR . -3/8" x 3/8" push fit male adapter. I got mine at Lowe's for $3.49. http://ow.ly/ZsXY5 . Here's he same one on Amazon http://ow.ly/ZsY08 -(4) M3 x 14mm Socket Cap Screws. Approx. $0.15 at any hardware store. -(2) M4 x 20mm Socket Cap Screws. Approx. $0.15 at any hardware store. -(2) M4 Wing Nuts. Approx. $0.75 at any hardware store. -(totally optional) plastic thumb screw heads M3 & M4. These make it easy to remove screws without a wrench. I purchased these at McMaster Carr http://ow.ly/Zt07K , http://ow.ly/Zt0b9 -(totally optional) 4 pin JST connectors. I solder these onto my motor wires to make attaching and detaching the extruder motor really simple. I switch between plastic and clay printing frequently and am always swapping print heads. I bought these on Amazon http://ow.ly/Zt1kb Total Cost: $29.58 (excluding printed parts)