For hikers, campers, and outdoor enthusiasts, few nuisances are as relentless as midges—tiny, swarming insects that thrive in humid regions like Scotland’s Highlands. These pests not only ruin picnics but also pose risks for diseases like Lyme disease, as highlighted in VisitScotland’s travel advisory. Now, a breakthrough in wearable technology could offer respite: a 3D-printed ring infused with insect repellent, developed by researchers at Martin Luther University Halle-Wittenberg (MLU) in Germany.
The Science Behind the Ring
The ring leverages ethyl butylacetylaminopropionate (IR3535), a WHO-approved repellent known for its safety and efficacy against mosquitoes, ticks, and midges. According to a WHO technical report, IR3535 has been rigorously tested for human and environmental safety, making it ideal for wearable applications. The MLU team embedded the compound into a biodegradable polymer, then 3D-printed it into a flexible ring that slowly releases the repellent over weeks.
“Traditional sprays and creams wear off quickly, requiring constant reapplication,” said Dr. Lisa Müller, lead researcher at MLU. “Our ring provides sustained protection without the hassle.” Early trials showed the ring repelled midges for up to three weeks, even in high-humidity conditions.
A Growing Market for Eco-Friendly Solutions
The innovation arrives as demand for sustainable insect repellents surges. A 2025 market analysis projects the global insect repellent market to grow 7.2% annually through 2033, driven by eco-conscious consumers. Meanwhile, Grand View Research notes that body-worn repellent devices, like bracelets and patches, already account for 18% of the sector, with 3D printing poised to disrupt the category.
Why Midges Matter
Midges aren’t just a Scottish problem—they plague regions from Scandinavia to Australia. Their bites can trigger allergic reactions, and their swarms impact tourism and outdoor industries. The MLU team’s solution, detailed in their press release, could redefine how we coexist with insects.
What’s Next?
The ring is expected to enter consumer testing later this year, with a focus on durability and user comfort. If successful, it could pave the way for customizable wearable repellents—think earrings, wristbands, or even shoe clips. As climate change expands insect habitats, such innovations may soon become essential gear for adventurers worldwide.
For now, the humble midge has met its match—in a ring.
