Hi everybody, I' ve read, here and on the other forum, about HDPE and wanted to try that out. I checked the empty milk bottles and they are made out of HDPE but they are made out of 3 layers, one grey, one white and one black in between. I thought it was not good for making a slingshot so i made some experiments with colored plastic( bottle caps) but i was not happy with the resulst. I decided to give the milk bottle a try and the results are very nice. Look... Cutted in small pieces with a scissor... This is what i get after +- 20 minutes in the oven at 175°... The piece i made was just a test, it 1 cm thick but it is rock solid.