1. Prepare some room in your freezer for dismounted heatbed.
    • Prepare some room in your freezer for dismounted heatbed.

  2. Leave the heatbed inside the freezer for at least 30 minutes.
    • Leave the heatbed inside the freezer for at least 30 minutes.

  3. Use something sharp to lift one corner of the PEI sheet from the heatbed. Grab the lifted corner with your hand a completely remove the PEI sheet. Frozen glue will remain on the bed. Be careful not to scratch the bed itself!
    • Use something sharp to lift one corner of the PEI sheet from the heatbed.

    • Grab the lifted corner with your hand a completely remove the PEI sheet. Frozen glue will remain on the bed.

    • Be careful not to scratch the bed itself!

  4. Limonene (Lemonesol, D-limonene or something similar) Where to get Limonene.
    • Limonene (Lemonesol, D-limonene or something similar) Where to get Limonene.

    • Nitrile gloves

    • Paper towels

    • Keep in mind that Limonene can be extremely toxic for your pets, keep them out!

  5. Place the paper towels on the heatbed as shown in the picture. The whole glue surface has to be covered. Place the paper towels on the heatbed as shown in the picture. The whole glue surface has to be covered.
    • Place the paper towels on the heatbed as shown in the picture. The whole glue surface has to be covered.

  6. Spill Limonene on the paper towels until they are totally saturated with it Place the whole thing  in a plastic bag to prevent Limonene evaporation Place the whole thing  in a plastic bag to prevent Limonene evaporation
    • Spill Limonene on the paper towels until they are totally saturated with it

    • Place the whole thing in a plastic bag to prevent Limonene evaporation

  7. Let the Limonene do it's magic for at-least 40 minutes.
    • Let the Limonene do it's magic for at-least 40 minutes.

  8. Remove the bed from the plastic bag and place it on something disposable (old newspaper).
    • Remove the bed from the plastic bag and place it on something disposable (old newspaper).

  9. Get a plastic scraper and start peeling the glue from one corner. Paper towel partially soaked in the glue provides an easy way to manipulate the glue. Paper towel partially soaked in the glue provides an easy way to manipulate the glue.
    • Get a plastic scraper and start peeling the glue from one corner.

    • Paper towel partially soaked in the glue provides an easy way to manipulate the glue.

  10. Process can be repeated for the remaining glue. Process can be repeated for the remaining glue. Process can be repeated for the remaining glue.
    • Process can be repeated for the remaining glue.

  11. Clean the heatbed using water and paper towel.
    • Clean the heatbed using water and paper towel.

  12. Clean the heatbed using IPA (or something similar that can clear out grease marks) and paper towel.
    • Clean the heatbed using IPA (or something similar that can clear out grease marks) and paper towel.

    • After doing this, make sure that no dust and fibres from paper remain on the heatbed surface!

  13. Peel out about 2 cm (1 inch) of glue protector from the SHORTER side of PEI sheet as shown in the picture
    • Peel out about 2 cm (1 inch) of glue protector from the SHORTER side of PEI sheet as shown in the picture

    • DO NOT try to peel out the sheet when it's glued, even in small area, it'll ruin the glue at that place!

  14. Bond the PEI sheet on the edge of the heatbed  shown in the picture. Make sure that the PEI sheet is placed as shown in the pictures (bottom edge of the sheet has to end at bevel of the heatbed and left side has to be aligned with edge of heatbed ) or covering whole printing area at least. Rub the rest of the exposed glue with scraper covered in soft fabric as shown in the picture.
    • Bond the PEI sheet on the edge of the heatbed shown in the picture.

    • Make sure that the PEI sheet is placed as shown in the pictures (bottom edge of the sheet has to end at bevel of the heatbed and left side has to be aligned with edge of heatbed ) or covering whole printing area at least.

    • Rub the rest of the exposed glue with scraper covered in soft fabric as shown in the picture.

  15. Peel about one cm of glue protector and rub it with the scraper. Repeat several times, do not try to peel and glue large areas at once, it'll will highly complicate the process! Peel about one cm of glue protector and rub it with the scraper. Repeat several times, do not try to peel and glue large areas at once, it'll will highly complicate the process!
    • Peel about one cm of glue protector and rub it with the scraper. Repeat several times, do not try to peel and glue large areas at once, it'll will highly complicate the process!

  16. Cut the extra PEI using sharp knife or razor blade
    • Cut the extra PEI using sharp knife or razor blade

  17. Sparkling new print surface, just mount the heatbed back on the the printer and you can print!
    • Sparkling new print surface, just mount the heatbed back on the the printer and you can print!

  18. As the geometry of the printer might have slightly changed, you need to recalibrate the printer.
    • As the geometry of the printer might have slightly changed, you need to recalibrate the printer.

    • Please follow the chapter 6.3.1 Calibration flow and use the KIT version.

Finish Line

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Josef Prusa

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30 Comments

Where can I find a new PEI sheet to place? Specifications? Generic ones on amazon/ebay OK?

PappaD - Reply

Ordered this from Prusa. It's actually 3M 468MP with 200MP adhesive. https://www.amazon.com/dp/B01JPWSY6A/ref... for instance if you're in the US.

Nicolas -

Fairly straight forward and well documented. May I suggest though to mention to keep thermistor connector from contact with D-Limonene, as mine has melted and I had to reterminate.

Thanks!

Vadim Ryazanov - Reply

Also try to avoid getting D-Limonene on the underside of the bed, as this will dissolve the tape that keeps the thermistor in place. This happened to me.

I tried to ignore the problem, which was fine as long as I was printing PLA. However, when I switched to PET and a bed temp of 85, prints started failing with a "BED PREHEAT ERROR" (see http://help.prusa3d.com/mk2-firmware/pre...).

To fix this, you will need some tape that can withstand high temperatures. I used some aluminum tape for fixing gutters which is supposed to withstand temps up to 110° C (similar to http://www.tesa.com/industry/tesa-50565....).

And by the way, before removing the tape to replace, I was concerned I would not place the thermistor in the right location, but the thermistor location is marked on the underside of the bed. Such smart design!

Nicolas -

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