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.

-------- Affiliate links to items used in this video -------

Pyramid A1.1 3d printer https://amzn.to/3wfg2t3
The best polishing wheels ever https://amzn.to/2VjG2GK
Overture 3d printer filament https://amzn.to/2UqwwRC

The links above are affiliate links. This means that, at zero cost to you, I will earn an affiliate commission if you click through the link and finalize a purchase.

Alternative link to Pyramid 3d printer https://www.toautotool.com/collection...

Oleg Pevtsov's bolt video https://youtu.be/cDfMI5ahbJI

3d models https://www.thingiverse.com/thing:4693968 / https://www.thingiverse.com/thing:4700871