When you have a 2D plot in matplolib you can change the line width of spines (the containing box) as follows:
fig, ax = plt.subplots()
ax.plot([1,2,3])
spines = ax.spines
[i.set_linewidth(5) for i in spines.values()]
However this same methodology does not work for 3D plots. How could I change the axes line thickness for a 3D plot?
You can do this using the following code. I adapted the idea of accessing the axes in 3D from this answer. If you want to change the thickness of all the grid lines as well, refer to this answer by ImportanceOfBeingErnest
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
for axis in [ax.w_xaxis, ax.w_yaxis, ax.w_zaxis]:
axis.line.set_linewidth(5)
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