Use 1.75 mm filament to print the lid

170 millimeters85 mm × 27 mm
It is highly scalable

The diameter of the hinge on the upper shell is slightly larger, allowing the lid to open and close more smoothly

This design is tailor-made for the Casio FX-991EX calculator, but it is also suitable for most other calculators on the market

It is recommended to use PETG or ABS materials for printing. If you use PLA, the lid is very likely to break

Please avoid forming seams inside the hinge

When necessary, you can apply a little pressure to push the consumables in. If the situation is more extreme, you can also use pliers to assist in the process of pushing in the consumables.

It is recommended to print it first and test the assembly effect