Hello,

In this free sample you get 1 base of each size and shape.
Let me introduce this set of industrial bases available from 2€ at Damocles kickstarter.
With the kickstarter file you will get more than 750 bases of all sizes and shapes with matching pattern.
https://www.kickstarter.com/projects/alario/damocles-part-1-modular-industrial-buildings-for-wargaming?

You can have a building sample here:
https://www.thingiverse.com/thing:4224487

Oval
60x35mm 20 variations
75x42mm 16 variations
90x52mm 9 variations
105x70mm 7 variations
120x92mm 4 variations
170x105mm 3 variations

Rectangle
50x25mm 33 variations
60x40mm 20 variations
75x50mm 10 variations
100x50mm 8 variations
100x60mm 6 variations
100x75mm 4 variations
150x100mm 2 variations

Round
20mm 126 variations
25mm 84 variations
32mm 52 variations
40mm 34 variations
50mm 19 variations
64mm 10 variations
80mm 7 variations
100mm 4 variations
130mm 3 variations
160mm 1 variations

Square
20mm 122 variations
25mm 72 variations
32mm 42 variations
40mm 28 variations
50mm 15 variations
75mm 7 variations
100mm 4 variations