PCB Heatbed MK2a

£7.20

Ex VAT: £6.00

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Product Code:
HB_MK2a

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Description

If you want to print larger PLA objects or ABS you need a heated print bed.

Josef Průša designed the original PCB MK1 heat bed for the RepRap Prusa Mendel - see PCB Heatbed. We made a few updates with the MK2 boards, allowing through hole components and through hole wire connections, a hole for a thermistor through the centre of the PCB and putting the silkscreen on both sides. The new Mk2a board has further improvements including bigger cable holes and solder pads, and another mounting hole centrally located on the cable edge. This allows 3-point mounting for easier bed levelling, in addition there are holes for pins to be soldered on so an IDC connection can be used. For more information check out the RepRap wiki: PCB Heatbed MK2

To ensure even heat distribution, these boards are produced by directly etching 35um copper; no copper plating is carried out - see Josef Průša's warning about plated beds on the Wiki - PCB_Heatbed - WARNING. The boards are all individually tested to confirm even heat distribution and correct resistance. Henrik Akerstedt's YouTube video shows one of our heatbeds warming up in infra-red: see RepRap PCB Build Platform heating up.

The MK2 board has identical dimensions to the MK1 board and is designed to be mounted under glass; check out Prusa's mounting instructions: PCB Heatbed Mounting Instructions. There are pads and unplated through holes for connecting the power wires. Ensure that the wire you use is thick enough for 10 amps, and solder it to the pads on the track side of the PCB. It is a good idea to think about strain relief so your moving build platform does not flex the joint, which can lead to failure of the joint over time. We recommend routing the wire from the heated bed to strain relief on the supporting sheet before routing it to your controller/power supply.

Purchase options:

  • The PCB Heatbed MK2 board only
  • The PCB Heatbed MK2 board with two LEDs and a resistor

In addition there is an option to buy an EPCOS B57560G104F thermistor to fit the thermistor hole in the centre of the board for an extra £3. The thermistor measures board temperature and is supplied unmounted for all options.

You will need the following to mount the board (not supplied):

  • 20x20cm glass sheet, 3mm or 2mm (you can print directly to the back side of the board but no PCB is perfectly flat)
  • 4 bulldog clips
  • Nylon Washers, Cork washers or your preferred insulated stand offs
  • 4 M3 machine screws nuts and washers

There are pads and unplated through holes for connecting the power wires. Ensure that the wire you use is thick enough for 10A, and solder it to the pads on the track side of the PCB. It is a good idea to think about strain relief so your moving build platform does not flex the joint, which could lead to failure of the joint over time. We recommend routing the wire from the heated bed to strain relief on the thick sheet before routing it to your controller/power supply.

You will need the following to power the board:

  • 11A+ 12V power supply, either through your RepRap power supply or from a separate supply. The boards generally draw up to 12 amps briefly when starting from cold, and this falls to 9-10 amps at 60C (PLA operating temperature) and 8-9 amps at 110C (ABS temperature)
  • Thick cables: minimum 1.0 sq.mm recommended.

Note! - If you are powering the heatbed directly from the PWR2/BED MOSFET on a Sanguinololu controller, then you must divide the cable strands in two at the controller connector so as to use all 4 pins on the MOLEX connector - Pins 1 & 2 are 12V, pins 3 & 4 ground. This is to comply with the power rating of the MOLEX connector which could otherwise overheat. It is also strongly recommended to use a heatsink on the PWR2/BED MOSFET. Similar precautions against overloading/overheating should be taken with other controllers.

Optional LEDs

The LEDs are optional, but if you choose to install them you must also install the resistor. With the MK2, conventional through-hole components can be used instead of the surface mount parts. A 1k resistor and 2 through-hole LEDs are supplied if you choose that option in the listing. Install the LEDs with opposite polarity so that one or the other will light up regardless of the power supply polarity.

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Think3DPrint3D

Think3DPrint3D is a family business based in Peterborough UK, supplying components and complete 3D printer kits to individuals and resellers around the world. Formed in 2011, we believe passionately in Open Source Hardware and the RepRap project. We aim to provide quality products at reasonable prices, backed by an exemplary level of customer service and technical support. We are actively developing new 3D printer and electronics designs.

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