*FIXC
r11, r12, r13
r21, r22, r23
.... r11: r*8: Radius r12: r*8: x-coordinate r13: r*8: y-coordinate
This card is used in conjunction with *AUTM, or *STLF to define the circular fixtures on the bottom of the build plate. All nodes within the defined circles are fixed in all 3 axes. The following figure illustrates the option.
Positioning of a circular constraint
Best Practices: Use *FIxC if practical to avoid overconstraining the part.