I built this 3D printer using mostly recycled parts, such as guides and belts recovered from old printers as well as the 12 V power supply.
It is a classic cartesian 3D fused filament printer that I was able to create thanks to the information made available by the RepRap project , before they were widespread as they are today.
With this printer I made the parts that make up my MPCNC.
The extruder was initially of the J-Head type, now replaced by an E3D metal extruder:
The extruder motor is a stepper motor:
On the Z axis there is a module mounted, to which are connected the extruder motor, the extruder with the relative temperature sensor and the fan:
The filament is held against the driver by a bearing pushed by springs:
The driver is made with a toothed wheel with straight teeth:
And its motion is reduced compared to that of the motor:
The filament spool rotates on bearings placed on the printer:
The heated bed is a PCB:
And it can be leveled thanks to screws and springs:
The axes guides are made with nylon bushings inserted in tubular steel:
The axis movement is belt driven:
There are adjustable belt tensioners:
And optical limit switches on the axes:
The guides are 8 mm round bars recovered from old printers:
The square profiles of the frame are screwed together in order to have a good rigidity of the structure even without reinforcements:
The electronics is a Generation 7 and mounts an ATmega microcontroller:
The four axis drivers are DRV8825:
I added an external control panel to the electronics:
Electronics, motors, heated bed and hot end are powered by a 12 V computer power supply:
