As of now, we do not have a formal membership, because we did not yet found a registered association. The Membership fee amounts to 15-20€ per month but should be lowered as soon as we have enough members to reliably cover the rent. 20€ are just a guide value, if you want to contribute more, you are welcome to do so. We need to pay the rent for the room at the beginning of each month via wire transfer, thus it would be great if you could pay the membership fee about one week before the beginning of the next month.