This is a simple bumper, sized for an Ikea wooden bed frame, to soften the sharp corners. It could be resized to fit other similarly designed bed platforms.

I printed this using standard PLA, but for a slightly softer effect you might try it with TPU. I haven't tried that yet; TPU doesn't always print reliably on my printer.

0.3mm draft mode as per the gnode file seems to work fine and prints in less than an hour.