wie heißt denn die Seite im Netz wo man das drucken lassen kann? Wie hoch sind denn die Kosten?

Von einem Schuber abreißen ? Ich steh da grad auf der Leitung :confused:

Und die Firma produziert den kompletten Lenti Magneten oder nur eine Lenti Folie die du dann auf einen Magneten kleben musst?

I got this done from SnapilyPro

They are based in the USA, but still cheaper than a UK based company I asked. The UK based company wanted £54 for one lenticular print.
This USA company only charge around $7 for one print, and shipping is $11 (so $18 total~£11)
When I just ordered 10 from them, it came to £46 total, inc. shipping. That is only £4.60 each, which is very cheap. The more you order, the cheaper it works out, as shipping only increases slightly.

Sizes
Full size - 5.24 x 6.66 inches
Smaller size (to fit inside embossed border) - 4.37 x 5.79 inches

Not sure how well they will fit though, because I had the Hunger Games one oversized on purpose, just so I could cut it to the right size when it arrived.
I measured lenticulars that came with steelbooks, and got the sizes from that.
I used the above measurements on the 10 I just ordered, so will have to wait and see how well they fit when they arrive.

It's very easy to use the website.
You have to use the wizard: http://www.snapilypro.com/wizard/flip/1/
Just upload the 2 images, choose white background, as you'll have to mount it to magnetic vinyl, and that's it.
I also went for rounded edges on the 10 I ordered, but did not on the Hunger Games (I rounded them myself) so again, will have to see what they are like when they arrive. I emailed them and the told me the radius used to round the edges is 1/8 inch, which is just over 3mm. I used a 5mm radius for the Hunger Games.