Plankton will get the secret recipe to the Krabby Patty someday!

Sheldon J. Plankton was originally created to be a one-off character, married to his computer, Karen. He was voiced by one of the show's writers, Mr. Lawrence, who had more ideas for the character than originally envisioned. The show's creator, Steven Hillenberg describes him as "more of a caricature of a villain."

This model shows plankton using a device to control Spongebob's brain.

It's a large model, about 12" from base to antenna tip. I like the irony.

In my example photo, he's actually greener than he shows there, but not as green as I like. Oh well, it's what I had on hand.

Printing instructions:

Supports: yes. I recommend tree support, maximum angle 45 degrees, from the build plate only.
Adhesion: use brims, especially for the joystick shafts and knobs.
Orient the body vertically for minimum scarring from the supports. Be careful; the legs are thin and could break if handled roughly
Orient the knobs vertically, resting on the collars.
Print the joystick shafts horizontally, using brims. This will give more strength to the shafts and create a flat part where it touches the plate. This will help when you assemble the model.
If you print the box separately, you shouldn’t need brims or supports.

Post-processing instructions

A burr-removing knife is helpful. The shafts will clean up much nicer using this tool.
Be gentle with the legs and antennae on the body.

Assembly Instructions

Glue the knobs to the shafts (super-glue gel works well)
Glue the flat part of the shafts to the side of each slot. I set it up this way so you can set the sticks to whatever angle you prefer.
Glue the pupil to the eye white, THEN the eye to the socket, and finally the eyebrow goes over that.
Plankton’s legs fit into two holes in the box. I don’t recommend gluing Plankton to the box; if you’re going to move the box, I’d pull Plankton off the box and carry him separately. The legs are reasonably strong, but it will keep them from being over-stressed by the torque of the body leaning or moving.