Over time the Kapton tape can start to develop bubbles or get worn out and will need to be replaced. The Kapton should also be replaced if something crashes into the bed.
- Remove the old Kapton tape by peeling it off from the print bed.
- Wash the bare print bed with isopropyl alcohol to remove any left over adhesive and dust from the surface.
- Remove the plastic protecting the adhesive side so that about 10 mm of the adhesive side is exposed. Align it to the edge of the print surface (as seen in green).
- Slowly remove the plastic from the adhesive as the Kapton is laid flat against the bed. Move slowly and apply pressure to ensure that no air bubbles remain underneath the bed.
- If a bubble does happen to appear, slowly lift the Kapton tape back up over the bubble and reapply while smoothing out the area where the bubble appeared.
- For best results, use a fine grit sandpaper to lightly scuff the surface of the Kapton sheet to help improve adhesion of the printed material to the bed.
- Clean with acetone and place bed back on to the printer.
If the bed was damaged by the nozzle printing into the bed, it is advisable to double check the z offset for the tool. (See 3.2 Setting Tool Length Offsets)