I like the candlecube by creaserra but I don't like seeing the flame so I created a diffuser, for simplicity in vasemode. As in the original model is nothing to hold the tea light in place I also added a hole to do so.
I printed it first in PLA and it works great, the one I printed in ASA sticked to the bed but got a little bit wavy upwords (see picture) what gives it a nice natural look of paper. Anyways I would recommend PETG. Both have a tight fit for me but depending on your accuracies you might need to scale it down to 99% or so.
The author remixed this model.