Case back opener tool for hewlet packard HP01 led calculator watch

thingiverse

Everyone should own an HP01 by now, it's a no-brainer. If you're out of luck without the original case back opener, print your own to fix the problem. I've attached the precise size file and scaled one, taking into account shrinkage for PLA prints (1.06 for that specific material). This tool is hollow, so in theory, you can resize it to accommodate other watches - including those with domed backs. However, keep in mind the limitations of working with plastic; excessive force might break off the prongs. On the other hand, it should be a relatively stress-free process.