This is a model of a 4 DOF robotic arm(designed on Solidworks) which can be used to move a syringe from one place to another. It's low cost, light weight, can be easily assembled and the electronics are readily available online.

Parts in the design:

8--3D printed parts (4 motor housings + 1 Gripper assembly + 3 support brackets)

4--Laser cut acrylic sheets

3-- Servo metal horns

2--Gears (2:1 gear ratio)

1--Clamping hub

1--Aluminium tube

1-- Roller bearing

Screws (Appx):

60--M3x8 Philip head screws

60--M3 nuts

3--Shoulder screws

3--washer

3--M2 nuts

Electrical Parts:

4-- HS785Hb servo motors(mentioned in black color in figure 2, Servo1 -servo4)

1-- TGY-RM-91 servo motor(mentioned in red color in figure 2, Servo5)

5--Heavy-duty servo extension

1- Servo controller ( more than 4 channel)/ Arduino

1-- Power supply (each servo draws 1.8A, so need a capable power supply)