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Ethan Gao

@ga0_lab • 5,083 subscribers

i make machines, but mostly 3d printers | 18

Shorts

Did you know you can create the Maxwell-Boltzmann distribution with just some balls and a motor? I built this simple device to illustrate it. This is how it works: A spinning agitator pumps energy into ~400 balls, so they bounce around and collide like gas particles in a box. They escape one at a time through a tiny hole, then fall a fixed gap into bins below. Since the hole is so small, every ball leaves with no vertical speed and takes the same time to fall. Constant fall time means how far a ball flies sideways is set purely by its speed. A faster ball goes into a further bin. So each bin is really a speed. Tally all 400 and you get the Maxwell-Boltzmann distribution.

Did you know you can create the Maxwell-Boltzmann distribution with just some balls and a motor? I built this simple device to illustrate it. This is how it works: A spinning agitator pumps energy into ~400 balls, so they bounce around and collide like gas particles in a box. They escape one at a time through a tiny hole, then fall a fixed gap into bins below. Since the hole is so small, every ball leaves with no vertical speed and takes the same time to fall. Constant fall time means how far a ball flies sideways is set purely by its speed. A faster ball goes into a further bin. So each bin is really a speed. Tally all 400 and you get the Maxwell-Boltzmann distribution.

497,193 views

The two bottom right gears’ D bore got stripped because the motor gets too hot. What material should I print it in instead?

The two bottom right gears’ D bore got stripped because the motor gets too hot. What material should I print it in instead?

13,221 views

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i'm ethan, just graduated high school. i build 3d printers and other hardware. this is where i'll be posting it.

i'm ethan, just graduated high school. i build 3d printers and other hardware. this is where i'll be posting it.

208,048 views • 1 month ago

I built this portable 3d printer. it folds flat, and a scissor lift lets it expand to print big objects. It's CoreXY, uses fishing line for the motion system, has a direct drive extruder, and the option of storing an 8-hour print time battery or an entire filament spool inside

I built this portable 3d printer. it folds flat, and a scissor lift lets it expand to print big objects. It's CoreXY, uses fishing line for the motion system, has a direct drive extruder, and the option of storing an 8-hour print time battery or an entire filament spool inside

167,913 views • 1 month ago

This 3d printer prototype has five axes. The bed spins and slides, the arm holding the nozzle moves up and down in and out, and tilts. Here, the translational degrees of freedom (XYZ) are held constant while the angular ones are allowed to change, essentially orbiting a point.

This 3d printer prototype has five axes. The bed spins and slides, the arm holding the nozzle moves up and down in and out, and tilts. Here, the translational degrees of freedom (XYZ) are held constant while the angular ones are allowed to change, essentially orbiting a point.

26,708 views • 1 month ago

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