The components are obtained from Servo Motor, the servo is disassembled and  you extract the potentiometer and the control board

The internal motor of the micro servo should be replaced, in his place its added  the Pololu 100:1 Micro Metal Gearmotor

Now print the components, there  are a five components, in the files section you should find the parts in different formats, you can download and print directly the .stl's

The screw puts in the piston

when in position, put the motor in the screw

now, put the set of compounds into the case

after, we must place the gear, special attention of the position since it has a way of fittingsince it has a way of fitting, the gear its a set with the potentiometer

The final step is to plug the three servo wires to the arduino (as you do with a servo), the arduino to your pc, upload the code( link over at the parts section) and use it. 

We also recommend begin experimenting with the sweep example on the servo section to get a glance how the mecanics work. Then up the game connecting and diconnecting digitally the actuator dy code to eliminate gittering and improve efficiency of the robot.

This instruction show how to change the actuator velocity through of the change the 3D model.

First download the model of screw from Files section, it must be taken into account that they are in several formats, so it will be easier to edit it in the software of your preference. We are used Autodesk Fusion 360, therefore the instructions will be detailed for this software.

Open the file and go to coil step and edit this characteristic,

When editing, the parameters that can be changed will come out

In the box Revolutions you can control the number of steps, with this you can control the speed of the actuator, for example, the screw of the image have a three revolutions and if you change for four revolutions the screw look like this

and if you change for two revolutios look like this 

For the complete the change of speed you need change the piston because it is a designed for the number of steps of screw, so for this purpose you need download the Piston file from the Files section and edit it. 

Just like before we are going to edit it in Autodesk Fusion 360.

Open the file and go to first steps,

Here in the step when inserting the screw, you can expand the content of this step, and you can see the step by step of the construction of the screw, there we will edit the revolutions of the screw to modify the piston.

Following the instructions given to modify the screw, we will edit the coil function

when editing the options box comes out where we can modify the revolutions of the screw that gives the internal shape to the piston, in this case it is in 5 revolutions but you can put the ones you need, for example using six revolutions look like this

Instead of telling you each parameter of your printer we made a profile file to upload to cura a get set on your printer. This is the best way to print with PLA. So go to files a search for Perfilimrpresion.curaprofile , then go to the lastest version of cura in Setting> profile>admin Profiles> select the file.

Dont forget to use the tree support on the experimental page, it will literaly change your life.