<p>For Kevin Martyn, who fixes wheelchairs for high-impact rugby matches at the Tokyo Paralympics, working with sports gear and prosthetics is the "ultimate puzzle".</p>.<p>The 37-year-old Canadian is one of the dozens of specialist technicians who have come to Japan to make sure athletes aren't let down by their equipment.</p>.<p>"I love these chairs, because they're built to hit each other as hard as they can," Martyn told <em>AFP</em> as he adjusted the height of a wheelchair's front bar in a pop-up workshop at Yoyogi National Stadium.</p>.<p>"They are built for impact, they get broken, and I love being able to be here to help fix them, so they can keep playing hard in a really intense sport."</p>.<p><strong>Also Read | <a href="https://www.deccanherald.com/sports/visually-impaired-paralympian-hit-by-self-driving-bus-1024118.html" target="_blank">Visually impaired Paralympian hit by self-driving bus</a></strong></p>.<p>He works for Ottobock, a German firm that has run repair shops at every Paralympic Games since 1988, with more than 100 staff from 23 countries on hand in Tokyo.</p>.<p>They are at venues and the main workshop in the Paralympic Village, where runners come to get their blades serviced and archers can have a custom fingerguard 3D printed.</p>.<p>"Every single job is different, and a challenge, and sometimes you don't know what you're going to get. For me, it's the ultimate puzzle to solve," Martyn said.</p>.<p>Ottobock brought 17,300 spare parts to Tokyo so it can carry out repairs quickly and efficiently.</p>.<p>But the company believes the load could one day be reduced through 3D printing, which is on trial in their workshop for the first time at the Tokyo Games.</p>.<p>"We shipped four large containers from Europe to here, because we never know what the issue is -- we need to bring a lot of stuff," said Peter Franzel, Ottobock's head of global events.</p>.<p>"We have a lot of tyres, screws, nuts and bolts... we have the knee joints for prosthesis, we have the feet, we have the sockets, we have the liners."</p>.<p>For now, 3D printing is too slow to make large items in time for competitions, and the products could be sturdier.</p>.<p>But Franzel has high hopes for the technology: "Maybe in the future, we only ship one 3D printer, and we print out everything we need."</p>.<p>The team had already completed 800 repair jobs in the 10 days to Friday, and are on call 24 hours a day for emergencies.</p>.<p>But Martyn said he has enjoyed it all.</p>.<p>"Being able to help even a little bit -- changing a tube, or fixing a crack -- you know you're making a big difference."</p>
<p>For Kevin Martyn, who fixes wheelchairs for high-impact rugby matches at the Tokyo Paralympics, working with sports gear and prosthetics is the "ultimate puzzle".</p>.<p>The 37-year-old Canadian is one of the dozens of specialist technicians who have come to Japan to make sure athletes aren't let down by their equipment.</p>.<p>"I love these chairs, because they're built to hit each other as hard as they can," Martyn told <em>AFP</em> as he adjusted the height of a wheelchair's front bar in a pop-up workshop at Yoyogi National Stadium.</p>.<p>"They are built for impact, they get broken, and I love being able to be here to help fix them, so they can keep playing hard in a really intense sport."</p>.<p><strong>Also Read | <a href="https://www.deccanherald.com/sports/visually-impaired-paralympian-hit-by-self-driving-bus-1024118.html" target="_blank">Visually impaired Paralympian hit by self-driving bus</a></strong></p>.<p>He works for Ottobock, a German firm that has run repair shops at every Paralympic Games since 1988, with more than 100 staff from 23 countries on hand in Tokyo.</p>.<p>They are at venues and the main workshop in the Paralympic Village, where runners come to get their blades serviced and archers can have a custom fingerguard 3D printed.</p>.<p>"Every single job is different, and a challenge, and sometimes you don't know what you're going to get. For me, it's the ultimate puzzle to solve," Martyn said.</p>.<p>Ottobock brought 17,300 spare parts to Tokyo so it can carry out repairs quickly and efficiently.</p>.<p>But the company believes the load could one day be reduced through 3D printing, which is on trial in their workshop for the first time at the Tokyo Games.</p>.<p>"We shipped four large containers from Europe to here, because we never know what the issue is -- we need to bring a lot of stuff," said Peter Franzel, Ottobock's head of global events.</p>.<p>"We have a lot of tyres, screws, nuts and bolts... we have the knee joints for prosthesis, we have the feet, we have the sockets, we have the liners."</p>.<p>For now, 3D printing is too slow to make large items in time for competitions, and the products could be sturdier.</p>.<p>But Franzel has high hopes for the technology: "Maybe in the future, we only ship one 3D printer, and we print out everything we need."</p>.<p>The team had already completed 800 repair jobs in the 10 days to Friday, and are on call 24 hours a day for emergencies.</p>.<p>But Martyn said he has enjoyed it all.</p>.<p>"Being able to help even a little bit -- changing a tube, or fixing a crack -- you know you're making a big difference."</p>