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  1. You need a silicone AC heating pad and a thermostat. I've used the two below. Silicone pad at 220V (souce a 110V if not in EU, where I live). Mine is 20cm x 20cm at 200W with 3M adhesive backing. They come at ~€10-€15 max.
  2. I've removed the temp diode that was with the silicone pad orignally (100K) as it didn't work with the thermostat (10K). I've used kapton tape to stick the thermostat diode on the bottom of the pad. No need for drilling the metal platform as the thermostat has a temp reading adjustment option and the difference between the readout and the actual temp was only a few degrees. Last step is to stick the silicone pad onto the bottom of the boxzy platform. Make sure there are no air bubbles left under the pad. Half way through!
    • I've removed the temp diode that was with the silicone pad orignally (100K) as it didn't work with the thermostat (10K).

    • I've used kapton tape to stick the thermostat diode on the bottom of the pad. No need for drilling the metal platform as the thermostat has a temp reading adjustment option and the difference between the readout and the actual temp was only a few degrees.

    • Last step is to stick the silicone pad onto the bottom of the boxzy platform. Make sure there are no air bubbles left under the pad. Half way through!

    • Update: Kapton tape failed after a good while. I've used a bit of 3M 425 alu tape (up to 150C continuous) to stick the diode directly to Boxzy platform.

  3. Connect the silicone pad, temp diode and power as per the thermostat diagram. Connection for the thermostat that I am using as per picture. I suggest 'soldering' the cable ends as it makes the whole connection as lot easier. Connect the silicone pad, temp diode and power as per the thermostat diagram. Connection for the thermostat that I am using as per picture. I suggest 'soldering' the cable ends as it makes the whole connection as lot easier.
    • Connect the silicone pad, temp diode and power as per the thermostat diagram. Connection for the thermostat that I am using as per picture. I suggest 'soldering' the cable ends as it makes the whole connection as lot easier.

  4. I've taken temp measurements using an infrared thermometer. 50C takes ~3minutes
    • I've taken temp measurements using an infrared thermometer.

    • 50C takes ~3minutes

    • 80C takes around 7 minutes

    • 100C took 11 minutes.

    • Pluses: super easy intallation, cheap, fast heating times, no need to interfere with Boxzy power supply (no need for a dedicated power supply altogether), no AC-DC efficiency loss. Minus: no control of heating bed platfrom from software.

    • My aim was to build a heating platform the simplest way I can think of. Hope this guide proves helpful :-)

Mario

Member since: 04/22/2016

1 Reputation

1 Guide authored

2 Comments

Works like a charm. Thanks!

Daniel Holmes - Reply

Hi, I used to work with industrial controllers. Often they had an output option for retransmission. This means that your controller could be set to read an input (ex: a thermocouple), and it would have an option to set a range (4-20mA = -20oC -> 180oC) and then provide an output that mirrored the input (ex:

a) if the thermocouple was reading -20oC the controller would re-transmit an output of 4mA,

b) if the thermocouple read 80oC, it would retransmit 12mA.

c) If the thermocouple read 180oC, it would retransmit 20mA.)

The advantage of this setup is that it allows an external system to read & monitor the temperature readings of the system and if the controller has a serial input, then it will allow the controller to be controlled externally (ex: by a labview program).

Has anyone located a cheap temperature controller which has re-transmit capabilities?

michael.ae.chernoff@gmail.com - Reply

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