Change custom word instructions:

1. Open paremetric-key-chain.blend file in blender
2. Select Text.001 object
3. Change to Edit Mode
4. Change text you like
5. Change back to Obejct Mode after editing text
6. Right mouse click > Convert To > Mesh
7. Change to Edit Mode
8. Select all object with mouse
9. Ctrl + E for extrude
10. Change back to Obejct Mode
11. Delete old Text.002 object
12. Select all object with mouse
13. File > Export to > Stl (Check option selection only in save dialog)
14. Print file