2. Machine threaded rod. A ¼” - 20 fully threaded rod will need to be cut to around 7.1” to fit inside the chassis. The threads will need to be removed from one end of the rod using a lathe, a dremel, or a file. A 0.5” section should be grinded down to a diameter of about 5mm. Check to make sure the rod fits into the linear coupler, but do not tighten the screws to attach the two pieces yet.

4. Slide the two 8mm linear rods into the holes one either side of the large centered hole on the chassis. Slide the carriage onto the rods inside the chassis. Make sure the cutout on the carriage is facing the syringe holder side. Insert the 8mm rods into the holes on the opposite side of the chassis.

5. Insert the threaded rod into the chassis and begin screwing it into the carriage. The end that has been ground down should be facing away from the carriage. Note: less screwing will be required if you begin screwing the rod into the carriage when the carriage is closer to the motor. Screw the threaded rod through the carriage and into the hole on the other side of the chassis.

6. Slide the linear coupler onto the grinded down end of the threaded rod.

7. Insert the shaft of the stepper motor into the linear coupler. Secure the motor to the back of the chassis using four M3, 0.5 x 14 mm screws.

8. Using a 5/64 allen wrench, tighten down the screws in the linear coupler to couple the stepper motor and threaded rod

9. Insert the Syringe_Holder into the slot in the chassis. Note: if it is too tight of a fit the sides of the syringe holder can be filed down until it fits within the chassis. The syringe pump is now fully assembled.