This LEGO printer is based on the Prusa I3 rework printer. The printer started as a A4-plotter with stepper motors from an old HP printer. After upgrading the stepper motors to Nema 17 motors I decided to build a X, Y and Z axis machine. This evolved in this printer.
LEGO and Nema 17 stepper motors are a perfect match. A default LEGO brick of 4 by 2 studs is 32 x 16 x 9.6 mm. Nema stepper motors have m3 holes at a distance of 31 mm. Attaching the Nema 17 stepper with LEGO technic, using a felt damper/isolator and m3 x 15 bolts, gives a solid base (image 4). See this Lego Dimension Guide for more lego math.
This is my first instrucable and it will not be a guide for creating this exact printer. I will give enough details to create such a printer. All information used to build this printer comes from the internet.
Warning: This printer is not a toy. Don't leave the printer while printing. The temperature of the heat bed can reach 110 degrees celcius. And the temperature of the printhead starts with 170 degrees celcius.
The printer is not a 100% LEGO printer. I don't have any LEGO Mindstorms products. Another reason is that LEGO motors are servo motors and 3d printers use stepper motors. Last reason is the software used to control the printer. I'm using Marlin for the Atmega 2560 and Pronterface on my laptop to control the printer.
Besides a lot of LEGO you'll need the following items from the Prusa I3 bill of material. The length of the rods depends of the size of the printer you are building. It's cheaper to buy pieces of 100cm than the default prusa i3 pieces.
Mechanical Parts and rods
- Smooth rod 8mm (3 x 100 cm)
- Threaded rod m5 (1 x of 100 cm)
- LM8UU linear bearing (11 x)
- Ball bearing 608 (2x)
- Flexible coupling 5x5 (2x)
- Nema 17 stepper (4x)
- GT2 Pulley (2x)
- GT2 Belt (200 cm)
- Y-carrier frame (1x, or use LEGO)
- Heatbed (1x)
- Glass Plate (1x)
- Binder clip (4x)
- Thermistor 100K (1x)
- Ramps (1x)
- Atmega 2560 (1x)
- Stepstick (4x)
- Endstop (3x)
- Power supply (1x)
- Ramps wiring kit (1x)
- Extruder with Nema stepper (1x)
Screws, nuts and washers depend on the build. Use m3 x 15 bolts for connecting the steppers to the LEGO.