3D Printing 101

It is basically a very precise hot glue gun

3D printer plastic comes as a long strand called filament, wound on a spool like really thick fishing line. The printer pulls the filament into a hot end, melts it at around 220°C, and squeezes it out of a tiny nozzle less than half a millimeter wide.

Hundreds of pancake-thin layers

The nozzle draws one slice of the toy at a time, like a pen that never lifts. Each layer is about 0.2 mm tall, thinner than two sheets of paper. When one layer is done, the printer moves up a hair and draws the next one on top. A Classic Flexi Dragon is around 300 layers and takes a few hours. My Grand Silk Dragon takes most of a day.

A computer program called a slicer does the math: it takes a 3D model and chops it into all those layers, then writes the path the nozzle will follow. That is the boring-sounding part that is secretly the most important.

The magic trick: print-in-place

Here is the part that surprises grown-ups. The printer can leave tiny gaps on purpose. If I design a dragon whose body segments wrap around each other with a small gap between them, the printer builds all the segments at once, already linked, never touching. When the print finishes, the whole dragon bends straight off the plate. No screws, no glue, no assembly. That is called print-in-place, and it is why my flexi toys wiggle the moment you pick them up.

Why it is a big deal for toys

• No molds. A factory toy needs a metal mold that costs thousands of dollars, so factories only make things millions of people will buy. My printer needs a file. I can invent a toy on Tuesday and sell it Saturday.
• Made to order, near you. My toys are printed in our house in Texas, not shipped across an ocean to sit in a warehouse. Less waste, no unsold mountains of plastic, and every toy already has a home before it exists.
• One-of-a-kind is free. Changing a color or a design costs nothing. That is why the Imaginator can turn your idea into a real printable model, and why the Oops Shelf exists: even the mistakes are originals.
• Kids can be manufacturers. This is the part I care about. The same machine a company uses for prototypes fits on a desk and obeys an eight-year-old. That was not true when Dad was a kid.

Mostly the toys are made of PLA, a plastic made largely from corn starch, which prints beautifully and comes in wild colors, glow, silk and sparkle. The see-through toys are PETG, the tougher cousin of water-bottle plastic. Every filament we use is from Bambu Lab, and the manufacturer safety documents for each one are published on our safety page. Quick honesty note: 3D printed things are never food-safe, whatever plastic they use, because the layer grooves cannot be cleaned like a smooth cup. Toys are for hands, not mouths.

The Lab's setup, for the curious: four printers (the flagship prints two colors at once and does most of the dragons), an automatic material system that swaps colors mid-print, and Norman, a supercomputer Dad and I built that helps design new toys. Curious how AI fits into that? That is the whole next course: AI 101.