This is a casting mold of a dog jumping/running. I used a zinc bismuth alloy and poured straight into the plastic mold. I've done this with both PETG and TPEE.

Products below:
https://www.rotometals.com/roto281-338f-low-melt-fusible-bismuth-based-alloy-ingot/

https://www.makergeeks.com/collections/maker-flex-1-75mm

Melted in a cast iron skillet over a charcoal grill. Please wear protection with this sort of project! I was wearing a face shield, long leather gloves, long pants and sleeves.