Instead of 6x M3x45 you need 6x M3x30 & 6x M3x10 screws and 12x M3 heat-set inserts with OD4.5 (optional).
Print this part 3 times and use it paired with 3 original core parts in the 3 different directions.
When using the heat-set variant, make sure to place a gear on the axial while pressing them in to prevent expansion and jamming (relatively slim walls)
The version to screw directly in plastic is not yet tested, open for feedback or play with XY-compensation.
The author remixed this model.
Instead of 6x M3x45 you need 6x M3x30 & 6x M3x10 screws.