the candle holders depicted have obviously been used in the past… 

invented for using up the assortment of random small cylindrical candles (christmas tree and smaller) that otherwise wouldve only been collecting dust 

can be printed in orientation of use w/o supports. 

warning print in flame retardant material and do not let unsupervised when lit. 

I printed in PLA and when extinguishing the candle early enough that works too – be aware that PLA is easily flammable !