Carbon build plate holder / clamp

Additional parts:
-Two or three M3 screws (length 10mm) and nuts (aliexpress, $2)
-A carbon sheet 200x300x0.5mm (aliexpress, $10)
-Silicone remover (e.g. acetone) to initially remove silicon from the carbon sheet

Put the two printed parts and the carbon sheet together as shown in picture three, then put two or three screws through the holes and tighten the structure with the nuts firmly (the upper part should bend). Put the clamps around the z-axis bearings of the printer and push everything down softly until the carbon sheet is perfectly aligned to the heated bed. Level the print head again and you're ready to print on carbon.

As there are only two clamps connecting to the z-axis bearings it is fast to install, and to remove the build plate after a print (no need to wait for the heated bed to cool down in order to remove a part). While there are only two clamps it is still perfectly stable. All parts (incl. screws) are out of reach of the print head, no matter how you mount it - crashing the print head is impossible.