Create a unique phone case with a built-in car key holder using a 3D pen! This DIY project combines creativity and practicality, helping you keep your keys and phone together while showing off your artistic skills. Perfect for DIY enthusiasts and tech lovers.<br /><br />#DIY3DPen #PhoneCaseDIY #CarKeyHolder #CreativeDIY #TechHacks #PracticalDIY #3DPrinting #DIYProjects