Hi Alexander, the problem is hidden in python syntax. The 'attrs' argument should be a list or tuple. So if you use export.textExt('../../tmp/data_export_melangeur.txt',format='x_y_z_r_attrs',attrs=(' b.mat.id',)) # notice the comma, making ('b.mat.id',) actually a tuple, (' b.mat.id') is just one string it should work cheers Jan 2015-02-10 12:37 GMT+01:00 Alex