Thank you very much RCLifeOn! I followed all your instructions in the video and created a faster to print 12cm version. Original design: https://www.thingiverse.com/thing:2761284
Tip: i used multiple processes in S3D to print it in 0.2mm layer height up to north england and then in 0.1mm. so i didn´t need support, had a fast print and a almost perfect top without gaps!
UPDATE: i added a 6cm version and a 12cm version with more contrast (the oceans are darker)