UPDATE: 

amiibo shelf V2 

I've been looking for a simple shelf for amiibo to print myself for a while, but since I wasn't happy with almost any of them, I created one myself. You don't need any glue, it sticks on its own thanks to the plug connections.it can be stacked from 1x3 to 3x3.I also created parts 1 and 2 without a connection, in case someone only wants to go up one or two steps.
It worked well for me if I print it with the legs pointing upwards + support on.

shelf part 1: 
L   195.05mm
W     72.7mm
H       50mm
printing time: 2:20h
required filament: 50g

shelf part 2: 
L   195.05mm
W      2.7mm
H      100mm
printing time: 3h
required filament: 52g

shelf part 3: 
L   195.05mm
W       65mm
H      150mm
printing time: 3:30h
required filament: 51g

legs connector (x2):
L    14.6mm
W     8.3mm
H     1.5mm
printing time: 2m
required filament: 0.27g

Printed with Bambu Lab A1 & Elegoo PLA Green