Tool for removing Lenco doxagon back case

Tool for removing the back case from an old Lenco watch. The back case on the watch is a screen-in and it needs a doxagon/12 edged tool to remove it. The doxagon has a distance of 26.4mm between two sides and 28.3 between two opposite edges. The one in the picture has been printed in Devil Design yellow PETG on a CTC Bizer Dual.