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    Acrylatic glass (PMMA) and IR sensor

    IR Height Sensor
    buildplate pmma acrylic glass ir sensor
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    • Captain_sq
      Captain_sq last edited by

      Hi,
      I'm experimenting with an uncommon build plate material - PMMA. It has good adhesion properties with PLA, almost too good. The plate is 3 mm thick and is heated to about 45°C which is more than enough to make PLA stick. I get inconsistent readings from the IR sensor at various places. The surface it rests on is painted matte black but I'm wondering if it would have been better to paint the rear side of the PMMA plate itself.

      Now, is it the black surface under the PMMA plate that reflects the IR signal or is it the top surface of the PMMA?

      Custom made Kossel Mini - Duet WiFi / Modded Tronxy X5S - Duet WiFi / Prusa i3 MKIII


      Embedded systems designer, RC Pilot, maker and Gadget-o-holic

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      • dc42
        dc42 administrators last edited by

        When using a bed material that is transparent to IR, the aim is to have as little reflection from the rear side of the bed as possible, so that the reflection from the top surface dominates. That's why I advise using a black surface underneath. If the sheet is glued down to the heated plate, then you need to paint the underside black before applying the glue or adhesive sheet, otherwise the adhesive will reflect too much.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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