http://www.mattkeeter.com/projects/antimony/3/

$fn=50;
lenght = 10;
lenght2 = 5;
height1 = 2;
height2 = 5;
width = 4;
space = 0.2;

hole_radius = 0.9;
rod_radius =1;

module hole(pos){
	translate([0,0,-0.01]){
		linear_extrude(height = height2){
			translate([pos,width/2,0]){
				circle(r = hole_radius+0.01);
			}
		}
	}
}

difference(){
	union(){
		cube([lenght,width,height1]);
		translate([(lenght-lenght2)/2,0,0]){
			cube([lenght2,width,height2]);
		}
	}
	union(){
		union(){
			hole((lenght-lenght2)/4);
			hole(lenght-(lenght-lenght2)/4);
		}
		translate([lenght/2,-0.01,height2-(height2-height1)/2]){
			rotate([-90,0,0]){
				linear_extrude(height=width+0.02){
					union(){
						circle(r=rod_radius);
						translate([-space/2,-height2,0]){
							square([space,height2]);
						}
					}
				}
			}
		}
	}
}

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the Uno and
  Leonardo, it is attached to digital pin 13. If you're unsure what
  pin the on-board LED is connected to on your Arduino model, check
  the documentation at http://arduino.cc

  This example code is in the public domain.

  modified 8 May 2014
  by Scott Fitzgerald
 */


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  pinMode(2, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(2, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);              // wait for a second
  digitalWrite(2, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);              // wait for a second
}

Attiny development bard http://qr.ee/attiny
от DigiSpark плюс
Драйвер шагового мотора ULN2003A http://qr.ee/uln2003a
плюс немного лего.

Схема подлючения проста до безобразия.
attiny bard uln2003
PN0 IN1
PN1 IN2
PN2 IN3
PN3 IN4
GND GND
+5 +5

Програма из примеров arduino
нужно лишь изменить строку с настройками
Stepper motor(200, 0, 1, 2, 3);

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