Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Published on in Series RepRap Prusai3 Build Manual


In this guide, we will assemble electronics and wire them up as per below diagram

Prepare the RAMPS electronics

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Install Jumpers

Short the PINS (Highlighted in Green) under Step Stick using Jumpers

Theses jumper determines the stepping mode of the step stick. Four our application 116 micro stepping mode should be used, it means all 3 jumpers need to be installed under drivers for 116 micro stepping mode

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Installing StepStick

Install heat sink on Step Stick

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Assembling RAMPS and Arduino

Assembling RAMPS means simply stacking RAMPS1.4 shield on top of Mega 2560.

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Note: Make sure to Match the PIN in Step Stick and RAMPS, else the step stick will be damaged

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Step Stick Assembly, note the direction of Trim Pots,

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Make sure your assembled electronics looks like the picture

Wiring RAMPS Electronics for RepRap Prusa i3

RAMPS After Assembly

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Wiring Components

Connecting Hotend, HeatBed

Connector Pairs D8, D9, D10 are used for connecting these devices. This configuration is based on Firmware configuration (Marlin). Depending on your Marlin firmware configuration you can wire the hardware

  • Configuration 1: Hotend (D10) + Fan (D9) + Heat Bed (D8)
  • Configuration 2: Hotend (D10) + Hotend (D9) + Heat Bed (D8)

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Connecting Hotend, HeatBed

Connector Pairs D8, D9, D10 are used for connecting these devices. This configuration is based on Firmware configuration (Marlin). Depending on your Marlin firmware configuration you can wire the hardware

  • Configuration 1: Hotend (D10) + Fan (D9) + Heat Bed (D8)
  • Configuration 2: Hotend (D10) + Hotend (D9) + Heat Bed (D8)

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Configuration 1: Hotend (D10) + Fan (D9) + Heat Bed (D8)

Fan is optional, you can leave it unconnected

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Configuration 2: Hotend (D10) + Hotend (D9) + Heat Bed (D8)

Some of India makers asked us how to connect two extruder setup

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Connecting Thermistor, Limit switch and Power supply

Each is explained in separate sections below

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Connecting End Stops

Each is explained in separate sections below

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Wire the power supply

We have modified the power supply and pre crimped the wire, so you can just plug and play without worries. We have used the branded ATX power supply, which is used in computer CPU box. The power supply has ratting of 450W-300W and can deliver up to 12V @ 15A which is sufficient for driving the PCB Heatbed and all its electronics

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Connecting Thermistor

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

In the Picture T0, T1, T2 are for thermistor: Hotend 1 (T0), Heat bed (T1), Hotend (T2)

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Connection Diagram

After following all above steps, your wiring should look like below diagrams

Connection Diagram 1

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Connection Diagram 2

Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer

Help us improving this documentation, leave your comments, suggestion and correction in the comments section.


This article is part of RepRap Prusai3 Build Manual series.

  1. Bill of Materials for PrusaI3 3D Printer
  2. How To Assemble RepRap Prusai3 Frame
  3. Wiring RAMPS Electronics for RepRap Prusa i3 3D Printer [This Article]
  4. How To Configure and Compile Marlin Firmware
  5. How To Configure Slic3r for RepRap Prusai3
  6. FAQ on RepRap Prusa i3 3D Printer
  7. How To Calibrate 3D Printer for Better Prints
  8. 3D Printer Troubleshooting Guide

TAGS: prusai3

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