I didn’t like the homing guides that ride on the surface of the stone as they quite easily mar the surface of the stone so this design uses a running guide style chisel holder.
One side of the carriage is set at 25° for the primary bevel, the other side is set to 30° for the secondary bevel.
EDIT:
I have added some alternate bases to suit the most common whetstones.
See: https://www.thingiverse.com/thing:4678840 for details and files.
They are designed to work with the same carriage as this design so you can just print the appropriate base to suit your stone.
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