This file I attached is the result of just selecting x581c01.dat in the toolbox of SR 3D builder and placing it in the model space and then saving it. Maybe a problem with SR 3D Builder??
By the way I use a clean fresh install of the latest official part and also downloaded and installed all unofficial parts only a couple of days ago.
But I realized that SR 3D Builder somehow deletes unofficial parts in the rebuild part list process.
But that only concerns duplicated parts, which are in the official and unofficial folder. see here
So I don't know why this part get saved this way. Mabye I should report it on the SR 3D Builder forum....
By the way I use a clean fresh install of the latest official part and also downloaded and installed all unofficial parts only a couple of days ago.
But I realized that SR 3D Builder somehow deletes unofficial parts in the rebuild part list process.
But that only concerns duplicated parts, which are in the official and unofficial folder. see here
So I don't know why this part get saved this way. Mabye I should report it on the SR 3D Builder forum....