The “bulkiest” part of the extruder consists of the motor and wire pusher combination. Therefore these are the ghost of printer, you can see any problem here directly on the print!
Motor of wire pusher
If we talk about motors of a 3D printer we are talking about stepper motors. What differentiates them from other types of electric motors is the ability to rotate their shaft in well-defined steps and to be able to keep it in a certain position by opposing a certain force to any opposite movement from outside.
The motors used for 3d printing follow the NEMA standards, and more specifically. However the 3D printing kits are normally fitted with NEMA 17 stepper motors with amperage ranging from 1.7A to 2.5A and a driving force of 4/5 Kg per square centimetre.
As already mentioned, these motors can move one step at a time. One step in degrees, to put it bluntly. They are identified with the number of steps they take to make a complete turn of 360°. In conclusion a small schematic that indicates the main subdivisions, goes from itself that the more steps the engine will use to make a complete turn the more precise it will be:
|Suddivisioni del giro completo||Angolo di passo|
These motors are then controlled by the drivers on the motherboard, here we propose a guide for the regulation of the voltage for an optimized use.
The motors are available from the most popular e-commerce:
Connected to the motor shaft is a toothed pulley, which is responsible for the suction of the filament by the extruder. In other words, the whole part of the wire pusher is composed of supports with springs that press the wire against the toothed pulley through a rotating part. In this way they allow the latter to have the necessary grip on the filament to push it inside the hot end and extrude it in the right quantities.
However, the wire pusher can be found in the most popular e-commerce: