Another boat: I was trying to dial in a 3D printer, the blobs on the hull seem to be caused by buffer under-runs from the Raspberry Pi. In the last Makevember post, there were some strange shaped Duplo links, here they are in use:
Duplo Trains
2 posts
This is version one of a set of Left-hand Switches made for MiniBoyGeek’s Duplo Railway Yes there is already a version two waiting to print, with additional check rails and re-designed mechanism: You can find it on ThingiVerse here