Although I loved the model by Lee David, the table my P1S sits on is just a few MM deeper than the printer, so no room for a supporting bridge, and magnets would not have held strong enough to support the whole assembly. I used a 200 MM chimney piece and grafted on a supporting tongue that sticks out and fits snugly under the edge of the printer, which holds everything securely in place and just at the correct height. It uses more support material, but worked perfectly for my setup.
The author remixed this model.
Added a 50mm tongue to the long chimney piece so that it will tuck under the printer and fully support the chutes weight.