* FABRIC WAVE
Large roller blinds will show fabric wavering or bagging.
It is impossible to make a large piece of fabric hang perfectly flat.
Blinds wider than 2500mm and / or longer than 3000mm are more likely to bag.
Consider splitting the blinds into two smaller blinds.
* FABRIC PATTENS
For roller blinds with a patterned fabric, the pattern grain won't usually line up perfectly with the horizontal or vertical edges of the blind. Expect to see variation of up to a few centimeters along the pattern direction from one side of the blind to the other.
* LIGHT BLEED
All roller blinds allow light to pass around the sides of the fabric (even with blockout fabric). Consider using face fit as an option rather than recess fit.