Controller board with gLCD panel
All jumpers and solder pads are clearly labeledThe MaKr panel with 128x64 pixel and microSD card slotBackside of the MaKrPanelAdditional signals are easily accessibleSchematic of the MaKr panel

MaKr Melzi Full Set

The full set includes the MaKr Melzi controller board, the MaKr graphic LCD control panel and 4 Pololu-compatible A4988 pluggable motor drivers. With support for 2 heaters, 1 fan and 3 endstops, a microSD-card reader on the gLCD panel board and a highly-modifiable and extendable design, this Melzi controller board is a fully Sanginolu-compatible all-in-one solution for controlling 3D printers with one extruder head, or light CNC machines with up to four axes (like ShapeOko or the OrdBot).

Product Description

What’s included:

  • 1 MaKr Melzi controller board [fully-assembled and tested]
  • 1 MaKr graphic LCD control panel [fully-assembled and tested]
  • 4 Pololu-compatible A4988 motor driver modules [fully-assembled and tested]
  • 2 cables for connecting the LCD panel to the controller board, 15cm, 6- and 10-pole
  • 4 metal standoffs (M3x30mm) for mounting the LCD panel to the controller board or housing
  • 4 M3 screws and 4 spring washers

Please note: Neither a microSD card nor a Mini-USB cable is included. To connect the board to your PC you will need an additional Mini-USB cable. For printing from SD card you will need a microSD card (card must support SPI mode).

About the MaKr Melzi controller board:

Our version of the Melzi board is compatible with both the original Melzi board and the RepRap versions as well with Sanginolu, but with these significant improvements:

  • Double the memory (128kB flash memory instead of the usual 64kB) allows you to take advantage of the gLCD’s full capabilities
  • Screw terminals for all electrical connections – no crimping or soldering required
  • Additional solder pads to allow addition of 2.54mm Molex connectors
  • Full support for dual Z-axis designs like the Prusa Mendel – pads for two parallel connectors for the Z-Axis
  • Power outputs can be used as direct spindle and pump drives for CNC applications
  • Comes with 4 pluggable standard motor driver modules, easily exchangeable
  • Nearly lossless reverse power protection, with no heatsink required
  • No heatsinks required for the power outputs, even at full load
  • USB-UART converter based on Microchip MCP2200 – offers up to 8 software controllable GPIO pins
  • Modification- and extension-friendly PCB design despite being based on SMT technology – all relevant internal signals are accessible at solder pads with standard 2.54mm pitch
  • Extensive documentation on the silkscreen – all connectors, jumper and pads are clearly marked (see product images above)
  • Switched DC/DC converter for 5V generation
  • Improved EMC protection for the microSD slot and the USB connection
  • Designed from the ground up with the requirements of mass production in mind, resulting in a lower sales price

Want more information about the MaKr Melzi board? Read the full story here.

About the MaKr graphic LCD control panel:

Our graphic control panel adds a comfortable user interface to the printer hardware to allow for stand-alone printing from a microSD card. It features a blue graphic LCD with white backlight, a microSD-card reader, switch encoder and buzzer.

The MaKr control panel connects very easily to the controller board – just plug in the two included cables. Our controller board even includes mounting holes that match up with the control panel’s PCB. Using the included screws and spacers the panel and board can be assembled into one compact unit without a big mess of cables.

The display contrast is fully software-controllable, no need for a contrast adjustment poti. The backlight can be switched on and off using any digital output signal. If connected to a PWM capable output, dimming is possible.

Want more information about the MaKr graphic LCD control panel? Read the full story here.

About the Pololu-compatible A4988 motor driver modules:

No soldering required! Our motor driver modules come fully assembled, including pre-mounted pin headers. Most other vendors leave this final assembly step to their customers.

These pluggable stepper motor driver modules are based on the Allegro A4988. They drive a motor at up to 1.5A at 8-35V, and are compatible with the well-known Pololu and StepStick driver modules.

Want more information about the MaKr motor driver modules? Read the full story here.

Still have questions? Send us an email!

Technical Specifications

MaKr Melzi controller board

  • Up to four pluggable motor driver modules, A4988 compatible
  • 2 high-current MOSFET outputs with PWM for heatbed and extruder, 10A max, not more than 15A in total
  • 1 low-current MOSFET output with PWM for fan, 1A max
  • 3 digital inputs for mechanical or optical endstops, 3 pin connection GND, +5V, input
  • 2 analog inputs for thermistor sensors 100k (heatbed and extruder)
  • USB-serial converter on board, based on MCP2200, Linux and MaxOS work out-of-the box, Windows requires a driver installation (min. Windows XP SP3 required)
  • Reset button
  • Arduino-compatible bootloader preinstalled, no special hardware required for firmware updates
  • CPU ATmega1284P at 5V and 16 Mhz
  • MicroSD slot on board
  • Atmel-ISP connector, 6 pin
  • Extension connector with 8 digital signals and power, 10 pin
  • Software-controllable LED (connected to PA4)
  • Fuse-protected DC input 10 to 30V, max. 15A (using screw terminals) or 5A (using 2.5/5.5mm DC power jack)
  • Reverse polarity protection on DC input
  • 5V power source jumper configurable between USB and on board 5V power converter (up to 200mA)
  • Size 220 x 58 mm², four mounting holes for M3 standoffs at the corners
  • Two additional mounting holes to hold the MaKr3D gLCD panel
  • Operating temperature 0°C to 30°C, humidity 10-90%, non-condensing
  • Storage temperature -20°C to +80°C

MaKr graphic LCD control panel

  • LCD resolution: 128 x 64 pixel
  • Display: white/blue (blue background, active pixels white), black metal frame
  • Visible area of the LCD: 55 x 27.48 mm²
  • Pixel size 0.39x0.39mm²; Total pixel pitch 0.43mm
  • LCD controller: ST7565R, SPI protocol
  • Viewing direction: 12:00
  • Encoder switch with press button, 24 clicks per round
  • Buzzer
  • MicroSD slot
  • 5V/70mA at full backlight brightness plus up to 100mA for the microSD card
  • Connects to the 6-pin Atmel ISP connector and another 8 digital lines
  • Total size: xxx
  • Operating temperature: -10°C to 60°C
  • Storage temperature: -20°C to 70°C

A4988 motor driver modules

  • Size: 15x20mm²
  • Adjustable drive current: up to 1.5A per motor (for more than 1A additional cooling required)
  • Logic supply voltage: 3.0 to 5.25V (at 3V max. motor current 1A)
  • Motor power supply voltage: 8 to 35V
  • Driver IC: Allegro A4988
  • Overheating protection
  • Supported stepping modes: full step, half step, microstep 1/4, 1/8, 1/16
  • Pre-assembled 2x8 pin connections, square pin

Still have questions? Send us an email!

Ready to Buy?
MaKr3d products are currently in production and will be available for delivery by the end of the year.

Please contact us at if you would like to place your pre-order now.

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