We worked the octagonal pattern for a few weeks and this seems to give the best balance between precision and grip. The tolerances on the insert for the blade id set for PLA, scale as needed. It should click in when you install the blade. the blades are less than a dollar and the print costs are minimal.

https://www.amazon.com/AFA-Tooling-Deburring-Blades-BS1010/dp/B08JS156JF/ref=asc_df_B08JS156JF/?tag=hyprod-20&linkCode=df0&hvadid=477368550213&hvpos=&hvnetw=g&hvrand=16293703470976594325&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032833&hvtargid=pla-1186909309831&th=1