Quantity   Component name
1 × M6 threaded rod 20 cm of rod is plenty. Medium strength steel is sufficient.
1 × Steel block, 60X60X30mm Any HSLA or mild steel will do, molybdenum or tungsten-bearing steels work the best and last a very long time
1 × Aluminum block, 60X60X30mm I used 6061 aluminum but others may work
1 × X-Pando Their standard product is fine: https://www.xpando.com/xpando.php and it can be purchased on McMaster. Seals way better than Teflon at high temperatures
1 × E3D Thermistor Semitec 104GT when sold elsewhere
1 × Heater cartridge Standard E3D size, but needs to be at lleast 60 watts instead of 40. I have a heater block that can use a standard silicon nitride diesel heater plug at 100 watts or so, but some printer boards might not be able to supply that much power to a single heater, so proceed with caution and read up on the data sheets for your respective MOSFETs
1 × Thermal compound For good thermal contact
1 × Borax For making an organic glass similar to boroglycerine
1 × penta-erythritol For making an organic glass similar to boroglycerine (reduces hygroscopicity)
1 × glycerol For making an organic glass similar to boroglycerine
1 × sodium hydroxide For black oxide coating of steel
1 × sodium or potassium nitrate For black oxide coating of steel
1 × sulfuric acid I used 70% but that is quite concentrated: if you have more dilute solution, just take that into account when mixing up an aluminum anodizing bath
1 × trisodium phosphate For anodizing titanium, zirconium or hafnium in case you want to make a super high-temperature extruder to print gold or steel
1 × zinc Roto Metals has good prices
1 × tin Roto Metals has good prices