“…Aspirations to build lighter active orthosis, which would be useful in everyday life turned engineers' attention, in the aspect of applied materials, to alloys. Similar strength properties, significantly lower weight, and higher breaking tensile stress-to-density ratio (162) than steel were the reason why aluminium is often used in modern bionic orthoses [68,69]. In general, materials used to create an exoskeleton are: bakelite, surgical stainless steel, aluminium alloys (copper, magnesium, or manganese), acrylonitrile butadiene styrene (ABS), polylactide (PLA), or shape memory alloys (SMA) [44,68,[70][71][72][73][74][75].…”