[KCLONE-Main board]

KCLONE-Main board is a feature rich all-in-one electronics solution for Reprap and other CNC devices.

It features an onboard ATmega2560. Its six motor outputs are powered by Pololu pin compatible stepper drivers.

The board features a developer friendly expansion port supporting giving access to all unused I/O, ADC and I2C pins.

KCLONE-Main board is designed to be flexible in the user's power source availability, allowing any power supply from 12V-35V.

Features :

• compact size: 120mm x 112mm

• fully integrated all in one solution:
  • Arduino 2560-R3 compatible (works with Sprinter, Repetier-Firmware, Marlin out of the box)
  • FT232R for high speed USB serial connection
  • Fuses and lockbits
    • ATmega2560 Fuses bits : EXTENDED = 0xFD; HIGH = 0xD8; LOW = 0xFF;
    • lock bits = 0xFF
  • Pre-installed Marlin firmware.

• UNIVERSAL POWER:
  • can be used with 12V-35V for motors / heated bed
  • integrated high precision power regulators (DC/DC) for:
  • 5V (ATmega2560/Logic)
  • power input auto select for ATmega/logic (stand alone or power from USB)

• easy DISPLAY + SD-CARD connector:
  • KCLONE-LCD board & RepRapDiscount SmartController compatible pin
  • Connector type : Box Header 20 pin / 2.54mm pitch

• up to 6 motor driver with easy micro stepping setup (jumper) which can be used for:
  • TRIPLE extruder
  • DUAL Z driver and DUAL extruder

• 4x temperature ADC connectors for thermistors (100Kohm):
  • e.g. 3x extruder thermistor + 1x heated bed thermistor
  • Connector type : Molex 5054-02 / 2.5mm pitch

• 5x PWM capable power mosfet outputs (24V):
  • e.g. 3x extruder heater cartridge + 1x Heated bed + 1x (24V) fan

• 6x end stop connectors with power supply(5v).
  • Xmin/Xmax/Ymin/Ymax/Zmin/Zmax
  • can be used for mechanical, opto, hall, ... end stops
  • can be used for proximity sensor (Zmin : 24v power)
  • Connector type : Molex 5054-03 / 2.5mm pitch

• 1x Auto Stop when filament run out connector
• Connector type : Molex 5054-02 / 2.5mm pitch

• 1x FILAMENT SENSOR connectors with power supply(5v).
• Connector type : Molex 5054-03 / 2.5mm pitch

• 3x Servo control connectors with power supply(5v).
• Connector type : Molex 5054-03 / 2.5mm pitch

• 4x Aux. control connectors with power supply(5v).
• Connector type : Pin Header / 2.5mmm pitch

• easy motor connection:
  • can be used with existing 4 pin Molex plug on motor cable
  • Connector type : Molex 5054-04 / 2.5mm pitch

• USB connector - Connector type : USB-B

• In use all clone 3D printers

• Made in KOREA

Microstepping

Some versions of the Rumba contain dip switches located underneath the driver boards, but current versions may contain a row of 3 jumpers.

[K.CLONE-LCD board]

This KCLONE-LCD Controller contains a SD-Card reader, a rotary encoder and a 20 Character x 4 Line LCD display. You can easy connect it to KCLONE-Main board using the IDC 20pin Cable.

After connecting this panel to KCLONE-Main board you don't need your pc any more, the KCLONE-LCD Controller supplies power for your SD card. Further more all actions like calibration, axes movements can be done by just using the rotary encoder on the KCLONE-LCD Controller. Print your 3D designs without PC, just with a g-code design stored on the SD card.

[K.CLONE-Motor Driver]

This is an Allegro A4988 breakout board for Sanguinololu. It can be snapped apart at the score in case of Allegro failure, and replaced with another or a Pololu. Snap all 4 apart and get a pin-compatible clones for use on boards like RAMPS or Gen7.

Now this is not for the iron wielding solderer. All parts are SMT, and somewhat small - there are some 0402 sized packages. Not to mention the Allegro's thermal pad - a solder pad on the bottom of the chip - can't be soldered without an iron of magic.

Adjusting and testing the current

You change the current to the motor by adjusting the trimpot. Set the trimpot to minimum to start with, by turning the trimpot fully anti-clockwise. Turn clockwise until the motors are not skipping steps at your target speed and load.

There is a test point for VREF on the Pololu but it is missing on the Stepstick. Since it is just the wiper of the pot you can measure it there and it is easier as it is a bigger target. I hold the positive meter probe on the shaft of a metal screwdriver so I can see the value while I am turning the pot. Put the negative probe on a ground pin.

To calculate the current, A = VREF / (8 * RS). For a standard stepstick, RS is the rating of the Sense Resistor = 0.2ohm. So A = VREF / 1.6

To calculate the VREF for a target current, VREF = A * 8 * RS , or A * 1.6 . So, if you wanted 0.8A, VREF = 0.8 * 1.6 = 1.28V