Design Safety Latch for Wrist Band

I need a safety latch for a wrist band, suitable for daily wear. The latch should be made of TPU or PLA. Requirements: - Material: TPU or PLA - Primary use: Daily wear - Attachment mechanism: Snap, slide,... (Budget: £20 - £250 GBP, Jobs: 3D CAD, 3D Design, 3D Modelling, 3D Printing, Engineering, Mechanical Engineering, Product Design)