I haven’t seen the Chemtek spacers, but if you look at how the oem does other tube sizes, it’s clear that “spacers” are pretty standard.
I had another member here print these for me…
IMO, using a 600ml bottle in a 750 (or 1000)ml rotor is wasting space that could be holding hash. Yeah, it gets it spun, but custom containers get you more hash faster than custom spacers.
I haven’t bothered with either. Just using the oem buckets without secondary containment probably gives the best bang for your buck.
The foam needed replacement every 10hrs or so.