Correction of fabricated shapes in additive manufacturing using sacrificial material

A method of fabricating a polishing pad using an additive manufacturing system, the method comprising:

• depositing onto a support a first plurality of successive layers by droplet ejection, wherein depositing the first plurality of successive layers includes
• dispensing a polishing pad precursor to first regions corresponding to partitions of the polishing pad, and
• dispensing a sacrificial material to second regions corresponding to grooves of the polishing pad;
• depositing a second plurality of successive layers by droplet ejection over the first plurality of successive layers, the second plurality of successive layers corresponding to a lower portion of the polishing pad, the first plurality of successive layer and the second plurality of successive layers providing a body;
• removing the body from the support;
• and
• removing the sacrificial material from the body to provide the polishing pad comprising a polishing surface having the partitions separated by the grooves.