Summary

I needed a table lamp for holding dinners in the garden, I thought of a design that would protect a bit the components in case the lamp was left out in the rain.
The "glass" was printed from transparent filament (not that transparent... oh well...) and the cap from white filament.

Update: added a wider cap, better at defusing the light downwards.

I used the following components:

low voltage E27 lamp
https://www.aliexpress.com/item/1005004839476884.html?spm=a2g0o.order_list.order_list_main.22.40711802BKQMPE

switch:
https://www.aliexpress.com/item/1005004137998165.html?spm=a2g0o.order_list.order_list_main.17.40711802BKQMPE

E27 holder:
https://www.aliexpress.com/item/1005003232988875.html?spm=a2g0o.order_list.order_list_main.5.40711802BKQMPE

for the battery terminals I used 7mm strips of zing (bought a 20x20cm from my local hardware store for ~5eur)

some of the measurements were not quite right so I ended up sticking the lamp with with hot glue, specifically: the battery terminals to prevent them from poping up when inserting a battery, the cap on top of the glass, the glass on top of the body (put a few tabs of hot glue from the outside of the lamp so they can easily be removed in case needed).
Hot glue can be removed with alcohol if necessary,