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Fig 3.1 The deposition head
At the top of the syringe casing is an acrylic board on which the syringe stepper
motor is mounted. The stepper motor is used for controlling the position of the
syringe piston, which is the main reason for material flow. The body is then put
together with the acrylic cut sheets available. This is done by fastening the sheets
together with screws and nuts. A 10cc syringe barrel and tip from Nordson, EFD is
used to be placed in this deposition head. The stepper motor is inserted with a lead
screw at the end of which is a shaft collar and shoulder screw. This lead screw is
driven by the motor which in turn pushes the material out the nozzle tip at the end of
the syringe barrel.
3.2.2 Assembling the chassis
The chassis is the most important feature of the Fab at home machine, as it is the
body and it contains a mixture of several sub assemblies:
The machine base, which holds and encloses all of the other subassemblies
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