Designed a longer, taller more simplistic candle tray in tinkercad awhile ago for a friend's washroom decor. Ended up bringing it into Fusion 360 and rounding the edges and corners after doing a smaller model meant for coffee tables and other living space surfaces.

Might want to bump up the infill to 20% or more to make the top layers of the inner surface smoother. It may be hard to bridge the inner corners without enough infill to support it, even if you don't need it to be sturdy and want to save filament and time.