Update bed.md

docs/hardware/bed.md

@@ -113,6 +113,7 @@ However, I have to mention that I didn't print with higher bed temperatures than
       ![Cut section](../assets/images/bed_insulation_cutout_web.jpg)  
     - Place the spacers above the premarked holes and cut away the insulation in that area as well, so that the spacers will touch the plate later without any insulation between. I'd recommend to mark the areas that should be cut and then take the insulation away from the bedplate, so that you don't harm the surface when using a sharp knife or so.   
     - When it comes down to finally apply the insulation, *I personally would suggest to cover the whole surface of the bed with Kapton tape first,* just in case you'd have to tear off the insulation in the future. I also added two layers of Kapton tape especially above the contacts and the little piece of foam of the thermistor in the center of the bed and marked that area roughly at the insulation, just in case I'd have to replace the thermistor in the future.  
+      *Make sure there are no bubbles trapped underneath the Kapton tape though!*    
       ![Adding Kapton](../assets/images/bed_insulation_kapton1_web.jpg) | ![Adding Kapton](../assets/images/bed_insulation_kapton2_web.jpg)   
     - Once everything is done and prepared, you can finally apply the insulation. Make sure you start at one side to avoid any bubbles, you want the insulation to stick on the bed equally. If some of the insulation protrudes beyond the plate, cut it off. The following picture shows the applied insulation. <br> ![Bed insulated](../assets/images/bed_insulated_web.jpg)   
     - *I highly recommend to additionally secure the insulation by using some pieces of Kapton tape as well to ensure that the edges and sides of the insulation won't come loose.* Don't skip this step, as the insulation most likely will come off sooner or later at the sides and edges (at least mine did).