Sending your child off to pre-school for the first time is apparently a stressful time for parents. But if you've properly prepared them for the challenges of dealing with other kids, like by playing with a 3D-printed baby rattle that looks like a miniature broadsword, they should be just fine.
The plans for this unique baby rattle are available for download from Targ's Thingiverse page. You'll just need access to a 3D printer to produce its four main components, as well as a bunch of tiny plastic peas that actually make it rattle.
Pair it with a tiny plush shield, and your kid might even be ready to face the perils of public school.