3D Coiled Cable Structure

import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure(figsize=(12, 9), facecolor='#ffffff')
ax = fig.add_subplot(111, projection='3d')
ax.set_facecolor('#ffffff')

n = 400
t = np.linspace(0, 12*np.pi, n)
z = np.linspace(0, 6, n)

# Cable structure
r_outer = 1.0 + 0.1 * np.sin(t * 0.5)
r_inner = 0.5 + 0.05 * np.sin(t * 0.5)

x_outer = r_outer * np.cos(t)
y_outer = r_outer * np.sin(t)

x_inner = r_inner * np.cos(t)
y_inner = r_inner * np.sin(t)

ax.plot(x_outer, y_outer, z, linewidth=2.5, color='#6366F1')
ax.plot(x_inner, y_inner, z, linewidth=2, color='#EF4444')

# Insulation layer
for i in range(0, n, 4):
    ax.plot([x_outer[i], x_inner[i]], [y_outer[i], y_inner[i]], [z[i], z[i]], 
            color='#10B981', alpha=0.25, linewidth=0.6)

ax.set_xlabel('X', fontsize=11, color='#1f2937')
ax.set_ylabel('Y', fontsize=11, color='#1f2937')
ax.set_zlabel('Length', fontsize=11, color='#1f2937')
ax.set_title('Coiled Cable Structure', fontsize=14, color='#1f2937', fontweight='bold', pad=15)

ax.tick_params(colors='#374151', labelsize=9)
ax.xaxis.pane.fill = False
ax.yaxis.pane.fill = False
ax.zaxis.pane.fill = False
ax.xaxis.pane.set_edgecolor('#e5e7eb')
ax.yaxis.pane.set_edgecolor('#e5e7eb')
ax.zaxis.pane.set_edgecolor('#e5e7eb')
ax.grid(True, alpha=0.3, color='#d1d5db')

plt.tight_layout()
plt.show()