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The filament of my choice is at the moment:
My favourite 3D-printer is:
Seahorse - 2D Wall Art by TWDesign
I liked the design and made it a 3D printable object. You can change the diameter, but you should keep the thickness at least at 2-3 mm.
Printed in black PLA.There are two 1 mm holes for nails, regular picture frame nails work great. If you make it smaller, you will have to drill new holes, but that should be easy with 10% infill.
Design by: https://pixabay.com/de/users/gdj-1086657/
Background by: https://pixabay.com/de/users/rani_ramli-731298/