Kindergarten backpack for a 3yo - with printed fasteners

thingiverse

This set is designed specifically for small canvas backpacks that kids typically carry to kindergarten, often with house shoes in tow. The sliding puller and tear-shaped cord end combo fits snugly onto a 6mm diameter cord, although it should also fit 1/4" imperial-sized cords. To accommodate thicker cords, the design can be easily scaled up; however, it's unlikely to work effectively with cords thinner than 4mm. To assemble these components, split the STL file and print them in the orientation they're designed for. The tear-shaped cord end screws together seamlessly, whereas the slider cap is press-fit and cannot be disassembled once put together. To ensure a secure fit, it's recommended to insert the cap only after threading the cord through and tying a sturdy knot at the end. This custom set was created with a child's needs in mind - namely, to securely fasten a small backpack that a little one can easily carry. The design incorporates rough dimensions for such a backpack (note that this is not intended for adults but rather for kids approximately 90cm or 3ft tall). For further details, please refer to the accompanying photos.