Please set four splines for a group(No need to selection),then print the array use this order: Every four spline knot print order is :1、3、5、...then 2、4、6、8.... Such as: group#1(spine1-4) #1knot of each spline s1.k1.pos.Y | s2.k1.pos.Y | s3.k1.pos.Y | s4.k1.pos.Y s1.k1.pos.Z | s2.k1.pos.Z | s3.k1.pos.Z | s4.k1.pos.Z s1.k1.pos.X | s2.k1.pos.X | s3.k1.pos.X | s4.k1.pos.X group#2(spline5-8)#1knot of each spline s5.k1.pos.Y | s6.k1.pos.Y | s7.k1.pos.Y | s8.k1.pos.Y s5.k1.pos.Z | s6.k1.pos.Z | s7.k1.pos.Z | s8.k1.pos.Z s5.k1.pos.X | s6.k1.pos.X | s7.k1.pos.X | s8.k1.pos.X group#3 group#4 ...... group#1(spine1-4) #3knot of each spline s1.k3.pos.Y | s2.k3.pos.Y | s3.k3.pos.Y | s4.k3.pos.Y s1.k3.pos.Z | s2.k3.pos.Z | s3.k3.pos.Z | s4.k3.pos.Z s1.k3.pos.X | s2.k3.pos.X | s3.k3.pos.X | s4.k3.pos.X group#2(spline5-8)#3knot of each spline s5.k3.pos.Y | s6.k3.pos.Y | s7.k3.pos.Y | s8.k3.pos.Y s5.k3.pos.Z | s6.k3.pos.Z | s7.k3.pos.Z | s8.k3.pos.Z s5.k3.pos.X | s6.k3.pos.X | s7.k3.pos.X | s8.k3.pos.X group#3 group#4 ...... group#1(spine1-4) #5knot of each spline s1.k5.pos.Y | s2.k5.pos.Y | s3.k5.pos.Y | s4.k5.pos.Y s1.k5.pos.Z | s2.k5.pos.Z | s3.k5.pos.Z | s4.k5.pos.Z s1.k5.pos.X | s2.k5.pos.X | s3.k5.pos.X | s4.k5.pos.X group#2(spline5-8)#5knot of each spline s5.k5.pos.Y | s6.k5.pos.Y | s7.k5.pos.Y | s8.k5.pos.Y s5.k5.pos.Z | s6.k5.pos.Z | s7.k5.pos.Z | s8.k5.pos.Z s5.k5.pos.X | s6.k5.pos.X | s7.k5.pos.X | s8.k5.pos.X group#3 group#4 ...... Then group#1(spine1-4) #2knot of each spline s1.k2.pos.Y | s2.k2.pos.Y | s2.k1.pos.Y | s4.k2.pos.Y s1.k2.pos.Z | s2.k2.pos.Z | s2.k1.pos.Z | s4.k2.pos.Z s1.k2.pos.X | s2.k2.pos.X | s2.k1.pos.X | s4.k2.pos.X group#2(spline5-8) #2knot of each spline s5.k2.pos.Y | s6.k2.pos.Y | s7.k2.pos.Y | s8.k2.pos.Y s5.k2.pos.Z | s6.k2.pos.Z | s7.k2.pos.Z | s8.k2.pos.Z s5.k2.pos.X | s6.k2.pos.X | s7.k2.pos.X | s8.k2.pos.X group#3 group#4 ...... group#1(spine1-4) #4knot of each spline s1.k4.pos.Y | s2.k4.pos.Y | s3.k4.pos.Y | s4.k4.pos.Y s1.k4.pos.Z | s2.k4.pos.Z | s3.k4.pos.Z | s4.k4.pos.Z s1.k4.pos.X | s2.k4.pos.X | s3.k4.pos.X | s4.k4.pos.X group#2(spline5-8) #4knot of each spline s5.k4.pos.Y | s6.k4.pos.Y | s7.k4.pos.Y | s8.k4.pos.Y s5.k4.pos.Z | s6.k4.pos.Z | s7.k4.pos.Z | s8.k4.pos.Z s5.k4.pos.X | s6.k4.pos.X | s7.k4.pos.X | s8.k4.pos.X group#3 group#4 ...... group#1(spine1-4) #6knot of each spline s1.k6.pos.Y | s2.k6.pos.Y | s3.k6.pos.Y | s4.k6.pos.Y s1.k6.pos.Z | s2.k6.pos.Z | s3.k6.pos.Z | s4.k6.pos.Z s1.k6.pos.X | s2.k6.pos.X | s3.k6.pos.X | s4.k6.pos.X group#2(spline5-8) #6knot of each spline s5.k6.pos.Y | s6.k6.pos.Y | s7.k6.pos.Y | s8.k6.pos.Y s5.k6.pos.Z | s6.k6.pos.Z | s7.k6.pos.Z | s8.k6.pos.Z s5.k6.pos.X | s6.k6.pos.X | s7.k6.pos.X | s8.k6.pos.X group#3 group#4 ...... +++++++++++++++++++++++++++++++++++++++++++++++++++++ For example : < first 1、3、5、7.....> group#1(spine1-4) knot1 -10.059 -10.324 -12.7768 -6.6107 0.0 0.0 0.0 0.0 -14.9818 -10.0916 -14.0142 -16.5328 group#2(spline5-8) knot1 -13.7723 -16.2252 -11.0052 -7.55686 0.0 0.0 0.0 0.0 -8.54056 -12.4632 1.667 0.116003 group#3(spline9-12) knot1 -22.7251 -25.1779 -19.2768 -21.7296 0.0 0.0 0.0 0.0 -8.54056 -12.4632 -10.0916 -14.0142 ...... group#1(spine1-4) knot3 -10.059 -10.324 -12.7768 -6.61066 4.43923 4.43923 4.43923 4.43923 -14.9818 -10.0916 -14.0142 -16.5328 group#2(spline5-8) knot3 -13.7723 -16.2251 -11.0051 -7.55682 4.43923 4.43923 4.43923 4.43923 -8.54056 -12.4632 1.66656 0.115564 group#3(spline9-12) knot3 -22.7251 -25.1779 -19.2768 -21.7296 4.43923 4.43923 4.43923 4.43923 -8.54056 -12.4632 -10.0916 -14.0142 ...... < Then 2、4、6、8、....> group#1(spine1-4) knot2 -10.059 -10.324 -12.7768 -6.61068 2.21961 2.21961 2.21961 2.21961 -14.9819 -10.0916 -14.0142 -16.5328 group#2(spine5-8) knot2 -13.7723 -16.2251 -11.0051 -7.55684 2.21961 2.21961 2.21961 2.21961 -8.54056 -12.4632 1.66656 0.115564 group#3(spine9-12) knot2 -22.7251 -25.1779 -19.2768 -21.7296 2.21961 2.21961 2.21961 2.21961 -8.54056 -12.4632 -10.0916 -14.0142 ...... group#1(spine1-4) knot4 -10.0589 -10.324 -12.7768 -6.61063 6.65884 6.65884 6.65884 6.65884 -14.9818 -10.0916 -14.0142 -16.5328 group#2(spine5-8) knot4 -13.7723 -16.2251 -11.0051 -7.55679 6.65884 6.65884 6.65884 6.65884 -8.54056 -12.4632 1.66656 0.115564 group#3(spine9-12) knot4 -22.725 -25.1779 -19.2767 -21.7296 6.65884 6.65884 6.65884 6.65884 -8.54056 -12.4632 -10.0916 -14.0142 ...... ++++++++++++++++++++++++++++++++++++++ Final print such as this: -10.059 -10.324 -12.7768 -6.6107 0.0 0.0 0.0 0.0 -14.9818 -10.0916 -14.0142 -16.5328 -13.7723 -16.2252 -11.0052 -7.55686 0.0 0.0 0.0 0.0 -8.54056 -12.4632 1.667 0.116003 -22.7251 -25.1779 -19.2768 -21.7296 0.0 0.0 0.0 0.0 -8.54056 -12.4632 -10.0916 -14.0142 -10.059 -10.324 -12.7768 -6.61066 4.43923 4.43923 4.43923 4.43923 -14.9818 -10.0916 -14.0142 -16.5328 -13.7723 -16.2251 -11.0051 -7.55682 4.43923 4.43923 4.43923 4.43923 -8.54056 -12.4632 1.66656 0.115564 -22.7251 -25.1779 -19.2768 -21.7296 4.43923 4.43923 4.43923 4.43923 -8.54056 -12.4632 -10.0916 -14.0142 -10.059 -10.324 -12.7768 -6.61068 2.21961 2.21961 2.21961 2.21961 -14.9819 -10.0916 -14.0142 -16.5328 -13.7723 -16.2251 -11.0051 -7.55684 2.21961 2.21961 2.21961 2.21961 -8.54056 -12.4632 1.66656 0.115564 -22.7251 -25.1779 -19.2768 -21.7296 2.21961 2.21961 2.21961 2.21961 -8.54056 -12.4632 -10.0916 -14.0142 -10.0589 -10.324 -12.7768 -6.61063 6.65884 6.65884 6.65884 6.65884 -14.9818 -10.0916 -14.0142 -16.5328 -13.7723 -16.2251 -11.0051 -7.55679 6.65884 6.65884 6.65884 6.65884 -8.54056 -12.4632 1.66656 0.115564 -22.725 -25.1779 -19.2767 -21.7296 6.65884 6.65884 6.65884 6.65884 -8.54056 -12.4632 -10.0916 -14.0142 Thank you barigazy again!