Correct. The 4 tubes have holes 1mmD, 0,75mmD, 0,5mmD and 0,25mmD. Only the 1mmD hole was good, with half-cured resin inside. it was relatively easy to clean. What I suggest: I thought of leaving breathe holes at the bottom of the tubes, to allow the resin inside to go down, and of course adding more pigments or graphite dust to prevent light rediation to cure resin inside the holes. I want to try with shorter exposure time too.