It is nobody's fault really.
I was going to make drip tips and decided against it, why? They are not cost effective for me to produce, they need to be mass produced. As previously posted, extruded acrylic cannot withstand the heat and, stresses set up during the manufacturing process and will manifest themselves when exposed to the heat/cool cycle. Delrin OTOH does not set up stresses, is not affected by heat generated by
vaping as is cast acrylic.