Ninja Tek ABS
Printed on end, with a BRIM.
These fit a little tight, so I'm going to print them enlarged to 105%. Found I could sand the inside to open up the clearance by running it on the tallest stone, which happened to be my 50 grit. After that, they slid on and off the other stones much easier.
Update (07/19/2019): I printed at 105%, and way too big. Then 102%, and still just a hair too big. So going to re-print at 101%.