Making a bolt with double threads 1 1

Making a bolt with double threads, does it work? – Lost PLA metal casting – 3d print to solid metal.

“Using the lost PLA metal casting I will turn 3d prints into metal castings in my DIY backyard foundry. I started by printing the models on my 3d printer. I then coated them with a ceramic material. I then fired the shell in my kiln and then poured metal into the shell. This is similar to the lost wax casting process.”