Furniture risers, designed to be low filament cost and stackable. 

• Each block raises by 3.5cm (~1.38 inches), and supports legs up to about 7.4cm (~2.9 inches) wide. 
• Support free due to 45 degree chamfer edges. 
• Fuzzy skin applied to outside walls (contour) to disguise the seam and longer print time at pattern level. 
• You can print up to 4 risers on 1x A1 mini plate at once.  
• To allow for a low infill to save filament, I inserted 4x (Primitive>Negative) rectangular pillars in the center of the model to ensure strength top-down.
• The top inner surface features a small hexagonal pattern, providing better grip for furniture feet, especially those with felt pads.
• From my own experience, PLA is certainly strong enough. No problem with our daughters bed or medium heavy dinner table. Consider increasing infill with e.g. large Sofa. 
• Printed with 0.08 layer height to minimize visible layers on the sides. 0.20 looked great too, but I didn't mind the extra time as it printed over night. 

See also: 

[https://makerworld.com/en/models/945458-stackable-furniture-risers](https://makerworld.com/en/models/945458-stackable-furniture-risers)