A heartshaped tealight holder.
The hole has a diameter of 40mm, to fit most tealights. The print can be scaled to fit bigger tealights if needed.
I have also added a bigger tealight holder that holds 3 lights.
Be aware that tealights can burn up to 150C, so use high heat resistant material if you have. The edge should be low enough, that it won't burn the plastic materials, but materials like PLA might start to soften.
I recommend putting electric tealights inside, if you have them.