Introduction: 3D Printed Robot Gripper - LittleBot Gripper

About: At LittleBots we are creating 3D Printed Robot Kits that get Kids excited about robotics and STEM

This 3D printed robot gripper was designed for the LittleBots Arduino Robotics Kits.

It uses a single microservo to actuate both fingers. Printing of the gripper takes appoximatly 1.5 hours.

The 3D printing files can be found on the LittleBots Website

The Servo is an MG90S micro servo. However since these can vary in size it is probably best to order the servo from the LittleBots 3D Printed Gripper Page

Step 1: 3D Print the Parts

Printer Settings for the Robot Gripper

  • Place the fingers on their flat side.
  • Place the Palm Open Side Up
  • No Supports
  • Material - PLA or ABS (PLA reccomended)
  • Brim - dependent on material
  • Resolution - 0.3 mm

Step 2: Insert Servo

Press the servo into the Palm, with the armature out, until it snaps into place.

Step 3: Attach Fingers

  1. GENTLY rotate the servo fully clockwise
  2. Attach the servo gripper finger. Place the armature hole onto the servo first then press the other side of the gripper onto the rotation nub. BE CAREFUL not to spread the finger gears too far or they may break.
  3. Apply the Idler Finger similarly. Ensure that the finger gears mesh so that the fingers are symmetrical.

Step 4: Secure the Servo Horn

  1. Close the fingers firmly and apply the servo horn.
  2. You may use a short servo mounting screw to secure the horn to the finger. BUT this can result in damage to the servo if the finger is jammed. We recommend leaving the horn loose.

Step 5: Attach the Gripper to the LittleBot Wrist End

The LittleBots are designed to have the servo slide onto their gripper attachment wrist end.

  1. Look at the wrist end and identify the top side (it will not be perfectly smooth and the rail will not be mushroomed at this end)
  2. Slide the gripper onto the wrist end.

Step 6: Enjoy the Gripper on Your Robot

Your robot has a gripper!. Enjoy.

Use arduino PWM signals to control the position of the Gripper.