about modeling method of counterbore hole on the bottom side —

Founded about modeling method of counterbore hole on the bottom side models & stl files for printing
3D Printer Model
ReginaFabricam
NEVA 3D Printer Model
ReginaFabricam
Gigabot 3D Printer Model
ReginaFabricam
RepRap Bioprinter Model
ReginaFabricam
Death Star 2
erikdiris
Anet AM8 3D Printer Model
ReginaFabricam