Adds springs at absolute positions to constrain the buildplate
*FISR r11, r12, r13, r14, i11, i12, i13, i14, i15 r21, r22, r23, r24, i21, i22, i23, i24, i25 ...
r11: r*8: min x-coordinate
r12: r*8: max x-coordinate
r13: r*8: min y-coordinate
r14: r*8: max y-coordinate
i11: i*4: x-coordinate [0 for free, 1 to add spring]
i12: i*4: y-coordinate [0 for free, 1 to add spring]
i13: i*4: z-coordinate [0 for free, 1 to add spring]
i14: i*4: material ID
i15: i*4: load case number
This card is similar to *FIxR. However, instead of fixing degrees of freedom, it adds nonlinear springs at specified degrees of freedom. The stiffness of the spring is defined using the *DASH card.