The glue gun was a hobby unit made for lower-temperature glue sticks. The small hobby unit eventually melted the PLA but only barely; the PLA came out more like softened putty. Based on this ...

A bot of melted glue sticks is poured into the mold, allowed to cool, and the mold sections are removed with the help of a heat gun after cooling. We doubt the weight and hardness make the tires ...

The built-in battery lasts for around 30 minutes, or the time it takes to melt through six glue sticks, and is recharged via a standard mini-USB cable, which most people have lying around the house.