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If using Bambu Studio make sure your wall generator is set to Arachne
If using Cura make sure 'print thin walls' is checked.
If you want to print a larger version scale up in all axes to 125% and print at 0.3mm layer height.
The one in the photograph is the original model with the top 4 layers printed in black using a filament swap. I have also added an 'easy print' version with a simple, solid first layer if you think your printer might struggle with the complexity of the first layer.