Print with 0.4 Nozzle and 0.2 layer height.
Dave's pill splitter is a very well made model. I printed with my worst PETG filament and it turned out perfect on first try!
The author remixed this model.
Adjusted pill holder in center of model to fit larger pills.
I made this adjustment with OnShape. Here is the link to the model:
https://cad.onshape.com/documents/f10d6174b75e1a72b79f9add/w/6ff52f508d0f7ec2c667cb56/e/ee3332e8393184675eab2fd5