3D drawing arrangement

A 3D drawing arrangement for producing a melted material flow by a filament, comprising:

• a feeding passage;
• a heater;
• a filament moving system;
• a controller which comprises a control circuit and a finger detector electrically connected to said control circuit, wherein when said finger detector detects a presence of a finger of a user which is aligned with said finger detector, said control circuit starts operation of said filament moving system to feed the filament to said heater along said feeding passage, so that the filament is heated and melted by said heater to produce the melted material flow, wherein said finger detector comprises a light emitter for emitting a detecting light and a light receiver for receiving the detecting light which is reflected by the finger of the user when the finger of the user is aligned with said finger detector;
• wherein said filament moving system comprises a driving motor and a filament moving blade, wherein when said driving motor is in operation, said filament moving blade is driven to move back and forth to urge the filament to move forward when said filament moving blade is moving forward;
• and wherein said filament moving system further comprises a driving frame, and a movement control mechanism which comprises a driving shaft which is coupled to said driving motor and a control wheel arranged on said driving shaft for engaging with said driving frame, wherein said filament moving blade is mounted on said driving frame, wherein when said driving shaft is driven by said driving motor to rotate, said control wheel is driven to rotate to drive said driving frame to move back and forth, so as to drive said filament moving blade to move back and forth.