To reduce keyboard bounce on my vintage Texas Instruments TI-59 calculator (a common problem with older TI models in general), I designed this padding sheet to replace the standard (and nowadays mostly deteriorated) foam pad between the calculator's keys and the contact circuit board.
With this fix, the bounce problem has mostly disappeared, and keypresses feel snappier compared to the usual method of inserting a piece of thin packaging foam or similar material. Still, I plan to experiment a bit more with the thickness of the raised pressure points as well as the material (e.g. TPU instead of PETG) to see if this could improve ergonomics a bit more.
Printed in PETG with a 0.4mm nozzle. You may need to be very careful with removing the print from the bed, as it is quite thin and fragile. Also, since parts of the model consist of a single layer only, make sure that you have good, fat extrusion to make that layer bond well.
- Disassemble the TI-59 as described in several walkthroughs on the net, e.g. here.
- Replace the original foam pad with this printed pad.
- Put everything back together ;)