Fits 70mm wide stone
Designed in Fusion360, Printed in PETG, 15% infill, 0.2mm layer height but any material and settings should work
Fins on the bottom help to keep the guide from scooping up the wet slurry from the stone, the guide also slides along the stone easily
Print with flat side down, no supports, any infill, any layer height
The author hasn't provided the model origin yet.