Category: HP-28S

3D print a new HP 28S case

Creating a new HP28S case I am working on creating a 3D image file in order to 3D print a new HP28S calculator case. My keyboard on the calculator had one row which would not work any longer, so in order to try to “fix” it, I had to open the HP case. Well there …

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How to open a HP 28S calculator

HP28S with Leister heatgun

If you never opened a HP28S calculator then this is quite challenging. I did quite a bit of searching and trying before documenting this post.  Why would you want to open the calculator in the first place? Well because it is not functioning 100%.  My post is divided into 4 sections Index Problem How to …

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