Did you enter a volume for each product using the format indicated in the readme file?
Yes, the Max volume is determined by the physical dimensions of the various USPS boxes and coded into the addin. The volume of each product must be input by you using the format indicated. IF there are 2 different boxes for a particular flatrate class, the larger of the two volumes is coded as the max.
My realworld example is our Product A which weighs 0.1 pound and has a volume of 13 cubic inches is entered into the weight field as
0.100000013
Copied from the ReadMe Instructions
Volume Filtering
This allows you to control shipping service quoting independently of product weight. One benefit is that some products may be large but light or vice versa. You can customise shipping quotes based on the products or product attribute weight.
You must apply the SQL patch described above in the install instructions. Then you add extra information to the products weight field.
You specify a weight for 1 unit of a product in lb.
Eg: Product A weighs 0.0625 (lb)
So volume (cubic inches) is defined by digits 6-11 after decimal point.
eg: Product A is a big inflated balloon weighing 1oz and is 6859.3 cubic inches.
Products A's weight is set to: 0.06250685930
USPS will not ship anything much larger so this impementation should cover all posibilities. The above also works for product attribute weights.
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