Is it possible to fix this overhang issue, without using supports?
Thanks!
Is that PLA?
More cooling. Take the top glass off. Open the door. Decrease the overhang cooling tolerance.
In cad you can replace the interior circular top with basically the top of a hexagon, and it will constrain the overhang angle to a printable one, and rely on bridge to connect the areas. Or similar such strats to avoid 70-89 degree overhangs.