Thinking Cleaner 800, iRobot Roomba 8xx DIY cover

Guide to make the Thinking Cleaner 500/600 fit on a Roomba 800 series (all models 8xx):
The heart of Thinking Cleaner is a small electronics circuit board (PCB) which is located in the plastic faceplate. You will have to remove the PCB from the faceplate (sorry, no warranty anymore) .
We have few pictures to show you how to remove the PCB from the plastic faceplate. With a sharp knife you can easily cut the rubber glue that was used to attach the board. The glue is positioned in the four corners and in the centre of the gap. You have to cut the glue in all four corners before you can pull out the board.
This Shapeways 3D product available here is designed for the Roomba 800 to protect the board and to fix it on the Roomba. There is a slight difference between Roomba 700 and 800 because the handle of both units is a bit different.

There is an instruction video for how to fit the printed cap on your Roomba: https://youtu.be/ztiTtWBcoXg

This design assumes you have a Thinking Cleaner for Roomba 500 or 600 and want to use it on the Roomba 700 or 800 models.
Thinking Cleaner for Roomba 500/600 is available on: 
Amazon USA,  
and
Robot parts