Mark2 Electronics Installation

Mark2 3D Printer

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Power

Mains socket installed

Socket Wiring Diagram

PSU Wiring Diagram

Wiring Mains Harness (Removed from printer for photo, must be wired with mains socket fastened in place)

Mains and 12V harnesses wired to PSU

PSU and mains socket installed

Caution:

There are many caution notes below. Please read them (and this section) carefully in order to avoid any accidents during installation.

Caution:

The power supply has a switch to select between 110/240V. Please make sure the power supply is set for the appropriate voltage for your region before connecting it to power.

Caution:

Always take care when dealing with electricity. You should make sure that the printer is disconnected from power whenever doing any wiring.

Caution:

Depending on your region, the wire colours of the mains wiring harness may not match what you are used to. Even if you are experienced in wiring mains power, please double check with the provided images.

Mains Power Connector

Requires:

• IEC320 Mains Socket Panel
• 2x M3x20mm Countersunk Bolt
• 2x M3 Hex Nut

The mains power panel allows the use of a disconnect-able power cable, and makes it easy to quickly switch power on or off if needed. Bolt the panel in place as shown.

Wiring

Requires:

• 1x Mains Harness
• 1x 12V Harness
• 1x 12V Power Supply Unit
• 1x IEC320 Mains Socket Panel

It is easiest to wire the power supply before mounting it in place. Begin with the mains wiring harness.

Loosen the screws on the L, N and G terminals of the power supply. Insert the forked end of each length of wire into one of the terminals, matching the colours with the images, and re-tighten the terminal so that the wires are held in place. Attach the other ends of the wires to the mains input panel as shown. In addition to the wires from the PSU, install the small brown cable between two of the pins on the input panel as shown. The crimp connectors fit firmly, and it may be easier to grip them using a pair of pliers during installation.

Next, connect the 12V wiring harness to the power supply. Connect the two red wires to the terminals marked positive / V+, and the two black wires to the terminals marked negative / V- (as shown).

Power Supply

Requires:

• 1x 12V Power Supply Unit
• 4x M3x15mm Bolt
• 4x M3 Spring Washer
• 4x M3 Plastic Spacer

Attach the power supply to the inside of the printer frame as shown. The bolts will only enter a short way into the power supply, so be sure to use the plastic spacers as shown.

RAMPS

Caution:

The MOSFETs and fuses on RAMPS, along with the pins on both RAMPS and the Arduino Mega can be bent out of place during shipping. This should not have caused any damage to the board - straighten the components where possible, and check for any broken connections.

Jumpers

RAMPS jumpers

Requires:

• 1x RAMPS Board
• 15x Jumpers

A bag of jumpers is provided with the RAMPS board. These jumpers need to go over the pins that sit underneath each stepper driver - place the jumpers as shown.

Mounting

RAMPS and Arduino Mega

RAMPS mounted to frame

Requires:

• 1x Arduino Mega2560
• 1x RAMPS Board
• 3x M3x30mm Bolt
• 3x M3 Hex Nut
• 3x 3mm Plastic Spacer

The RAMPS board plugs directly into the top of the Arduino Mega 2560 as shown. Both boards are then fastened to the side-panel using 3 sets of bolts, spacers and nuts, as shown. For the neatest wiring setup, the RAMPS / Arduino should be installed on the inside of the frame. However, if you intend to extend the X axis later, or if you are planning on frequently adjusting the wiring, it may make more sense to install the board on the outside of the frame.

Power Input

Wiring 12V Harness

Power and MightyFan Connected

• 1x 12V Wiring Harness
• 1x MightyFan Board

Run the 12V harness along the back of the printer, and up to the RAMPS board. Connect the wires to the power input terminals, noting the polarity as marked on the PCB. It may be easier to remove the terminal block from RAMPS, then re-insert it after wiring. Two additional wires are provided to power the fan expansion board - connect them to the provided MightyFan board, again noting the polarity as marked.

Once wired, connect both the power terminal block and the MightyFan board to RAMPS as shown.

Extruder

Fans

In a single-extruder setup, RAMPS has one connection dedicated to controlling a fan. However, we need to run two fans (technically we only need to control the print fan, the HotEnd fan just needs to be on whenever the printer is running). To make this easier, each Mark2 kit comes with a MightyFan expansion board which plugs directly into RAMPS. For additional information, refer to the MightyFan page.

• Connect fans in order (bottom to top):
  • 1: Print cooling fan
  • 2: HotEnd 1 Fan
  • 3: HotEnd 2 Fan (Dual-Extruder Only)
  • 4: Not Connected

Optional: LCD Add-on

Mount LCD Control Panel

• 1x LCD Control Panel
• 4x M3x20mm Bolt
• 4x M3 Hex Nut

Insert the control panel behind the cut out in the frame, and fasten it in place. Take care not to over-tighten the bolts, as they may place a strain on the control panel's PCB.

Connect Cables

• 1x Control Panel Adaptor Board
• 2x 10-Pin Ribbon Cable

The adaptor board connects directly to RAMPS as shown. The two cables then connect between the adaptor board and the control panel. Use the cut-out in the rear top-panel to route the cables to the control panel.

Optional: Raspberry Pi

The Mark2 frame has mounting holes for a Raspberry Pi model A+, B+, or Pi 2 B, which can be handy if you want to set up an OctoPrint server to control your printer remotely.

Other Electronics

Frame also has mounting points for these RAMPS alternatives:

• Melzi
• Smoothieboard

Other Resources

http://reprap.org/wiki/RAMPS_1.4

http://www.reprap.org/mediawiki/images/0/06/RAMPS_dossier.pdf

http://reprap.org/wiki/Prusa_i3_Rework_Electronics_and_wiring

http://www.nextdayreprap.co.uk/wiring-reprap-prusa-mendel-build-manual/