Filament sampler (economical one)

I came across a couple of filament samples. However, they were using too much filament for my taste, so I design a more economical one.

There are two versions - a round and a square one; I personally prefer the square one. The small hole is 2mm wide, so you can use filament to keep tag ordered.

The square is a 25x25 mm (just short of an inch), the round one is 25 mm in diameter.
The frame height is 2mm, the three layers are 0.4, 0.8, and 1.2 mm.

The print only takes about 10 minues and