Hey Garrett, I have issues milling HDPE and would need some help. the endmill portion with O-Flutes is not my issue but the V-carve part. it won't clear the chips. I believe they either re-weld or don't cut all the way which leaves a huge fuzzy mess. tried tried your 30/60/90deg bits in different feeds and speeds as well as Cody's grovee and some china bits. I am lost. any tips you can share are greatly appreciated! BR Axel