Whithin an app, I have a couple ExtraModels. It would be convenient to have one custom export for each, since the data are structured quite differently. Thanks!

It's not directly supported but one workaround is to toggle it based on a Heroku config var, e.g.:

def custom_export_model1(players):
    ...

def custom_export_model2(players):
    ...

def custom_export(players):
    import os
    export_mode = os.environ.get('CUSTOM_EXPORT_MODE')
    if export_mode == '1':
        return custom_export_model1(players)
    elif export_mode == '2':
        return custom_export_model2(players)

Then change those through the otree admin.

I'll try it, thanks!