This is the excellent kit of the German U-boot UB 1.
 
The Type UB I submarine (sometimes known as the UB-1 class[5]) was a class of small coastal submarines (U-boats) built in Germany at the beginning of the First World War. 20 boats were constructed, most of which went into service with the German Imperial Navy.[Note 1] Boats of this design were also operated by the Austro-Hungarian Navy (Kaiserliche und Königliche Kriegsmarine or K.u.K. Kriegsmarine) and the Bulgarian Navy. In the Austro-Hungarian Navy, it was called the U-10 class.
 
Built to meet the need for small maneuverable submarines able to operate in the narrow, shallow seas off Flanders, the vessels were intended to be quickly constructed, then shipped by rail and assembled at their port of operation.
 
This model is available either as a bundle of STL files that you print out yourself (files), or as physical parts (physical kit). Both variations include the custom brass photoetch parts needed to really bring the model to life. 
 
Available in the following scales: 
1/72
1/48
1/35
1/30 
 
Maximum part size for 3D printing: 
Scale 1/72     X=60 mm, Y=60 mm, Z=135 mm
Scale 1/48     X=90 mm, Y=90 mm, Z=201.6 mm
Scale 1/35     X=110 mm, Y=110 mm, Z=170 mm
Scale 1/30     X=150 mm, Y=150 mm, Z=208 mm
 
STL files, photoetch and drawings will be shipped to you from Europe. Please allow 2 to 3 weeks for delivery. Price includes worldwide delivery