Case back opener tool for hewlet packard HP01 led calculator watch

I assume everybody has an HP01? Well you should. And if you are unlucky enough not to have the original case back opener now you can print your own. I have included the correct size file and the scaled one to allow for shrinkage (1.06 for PLA). It is hollow so that in theory you can scale it and use it for other watches (including domed backs). Being plastic you cant apply too much force or the prongs may break off but you shouldn't have to. It is slim so it will fit inside the HP01 box.

Fee