As hospitals face an overload of COVID-19 patients struggling to breathe, innovative medical staff are turning to snorkelling masks from sports stores to stop their lungs collapsing. The idea started in Italy, the European country worst-hit by the coronavirus pandemic, with hospitals in other nations taking note and adding their own specific medical parts to make it work. One such is the Erasme Hospital on the outskirts of Belgium's capital Brussels. It is attached to the city's ULB university - and through it to a private spin-off, Endo Tools Therapeutics, whose knowhow in 3D printing for medical use has proved...