2" square clear ice cube mold

This thing is great! Read further:)

155mm tall x 54mm wide square tub with 2mm thick walls. Print tube with PLA and bottom plug with TPU 85A recommended. Wrap square tube with 1" dense foam insulation on all 4 sides and bottom (pink foam is far more dense than white styro). Tape foam box and leave top open (I used Pella Window tape which has aluminum exterior and rubber like glue on back so the foam contraption was waterproof).

Fill with room temp to warm tap water and this mold will freeze the ice from the top to the bottom. This is called directional freezing and the ice will be extremely clear at the top and the bottom will be cloudy and/or will not freeze after about 24 hours. Reason for this is once the water freezes about 4" down the tube (which is just over 6" tall) all of the impurities and air bubbles get pushed to the bottom 2" of the ice tube during top to bottom freeze process. From there, you cut the bottom end off the 2" wide 6" long cube and split the other 4"