This is a button cell holder that you can customise for any kind of cell. See https://en.wikipedia.org/wiki/List_of_battery_sizes for the size of different button cell For smaller diameter cell, I advise to add 0.2mm to battery_diameter_mm unless your printer can be very very precise

Included STL files for AG10/LR54, AG13/LR44 and CR2032

2020-08-21 Update:

• Allow to make hole on the bottom to be able to eject the button cell with a paper clip if gets stuck
• Allow multi column build
• Spacer is now calculted based on the button cell diameter. The idea is to have more space for the finger when the cell is small