I planning to go there ,too.
for me it would be cheaper to go by car and ferry.
I plan to drive from Fulda -> travemünde -> ferry -> malmö -> helsingborg
the ferry cost around 180€ and includes 5 persons and one car.
I feel very lucky, a 25 minute drive to get there.
Hihi... Looking forward to see some of you there It'll be my first trip to Sweden and also my first 3D Meetup and I'm really looking forward to it!