Nice work, Hood. The adjustable nozzles are COOL! Is it just flat bottom bore with an O-ring? And I assume the bolt head holds it from falling out.
Hard to judge sizes and hence speeds on the video - looks like it's too slow on the Delrin? I machine Delrin with chip-break inserts at 0.15-0.2mm/rev.
Oh.. is it your cross slide or your work bench