This is a remix for the beautiful Kumiko desk lamp: https://makerworld.com/en/models/210375?from=search#profileId-230226
It is meant for those who want to use a standard E27 lightbulb inside the lamp. In my case I used a dimmerable, rgb, smart bulb to include this lamp in my voice activated devices.
Note: The round slot has a 34,5mm diameter.