In the case of pandemic emergencies, a crucial lack of protective material such as protective goggles for medical professionals can occur. A proof of concept (PoC) and prototype are presented, demonstrating a reusable custom-made three-dimensionally (3D) printed breathing apparatus determined by materials and techniques (3D imaging and 3D printing) with global availability. The individualized 3D protective breathing filter consists of two 3D-printed reusable polyamide composite components (a breathing filter along with a filter membrane support) and 2 disposable components (a head fixation band and a filter membrane).
Supplementary Material online
3D modelling can easily be done by CAD designers worldwide with free download software. The disposable non-woven melt-blown filter membrane is globally available from industrial manufacturers producing FFP2/3 protective masks for painting, construction, agriculture, and the textile industry. Easily available Velcro fasteners were utilised being a disposable head fixation band. A cleaning and disinfection protocol is proposed. Leakage and virological testing of the reusable pieces of the 3D breathing apparatus, following one or several disinfection cycles, have not yet been performed and is also essential just before its use within real-life situations. This PoC should enable the reader to consider making and/or virologically testing the described custom-made 3D-printed goggles worldwide. The surface tessellation language (STL) format in the original virtual templates with the two reusable components described in this paper readily available for download no cost using the hyperlink.
We tested 14 commonly available masks or custom face mask alternatives, one patch of mask material, as well as a professionally fit-tested N95 mask. For reference, we recorded control trials where the speaker wore no protective mask or covering. Each test was performed with similar protocol. The camera was utilized to record videos of approximately 40 s length to record droplets emitted while speaking. The first 10 s of the recording serve as baseline. In the next 10 s, the mask wearer repeated the sentence “Stay healthy, people” more (speech), after which it the camera continued to record for an additional pair 20 s (observation). For each mask but for the control trial, this protocol was repeated ten times.