Paper design arrives. Use CAD software to render and convert it into an STL file ready for output. E-mail the design to the customer for approval.

The customer responds favorably to the design. Send it to the rapid prototyping machine for modeling.

Place the completed model into pre-mixed and vacuumed RTV compound. After a quick final vacuum, let the mold sit for 15 minutes to allow the bubbles to settle. Place the mold into a hot water bath for two hours.

Place the mold in cold water for 10 minutes, then cut. Proceed to shoot 10 waxes.

Sprue and tree the waxes, five per tree. Surround the trees with wax-coated paper tubes that  serve as flasks.

Place the prepared binder solution and high-speed investment into the vacuum mixer and mix for 1.5 minutes. Pour the mixture into the two flasks, vacuum for  one minute, and let stand.

After standing for 10 minutes, the flasks are at 180°F (82°C). Pop off the bases and let the flasks self de-wax. 

Place the flasks into a 1,600°F (871°C) preheated oven for one hour. The wax practically blows out of the bottom of the flasks at this temperature. When the cloud of smoke stops coming out of the   oven port, flip the flasks over for the remainder of the hour. 

Remove the flasks from the oven and set them, hole up, on a safe surface, such as a firebrick. Reset the oven to casting temperature  and crack the door.

Use an optical thermometer to check the temperature down the pour holes of the flasks. They should be close to temperature. Place the flasks back into the oven and prepare to cast. 

If you prepared the metal while the flasks were cooking, it should  take only 10 or 15 minutes to cast these two flasks. 

Break out and de-vest castings. Proceed to finishing, setting, and polishing, or place in mass finisher and complete the order the next day. If you prepared the metal while the flasks were cooking, it should  take only 10 or 15 minutes to cast these two flasks.