Add 3D designs repo link

input/stuff.md

@@ -20,7 +20,7 @@ for p in mpages:
 * **[cppcheck](https://trac.macports.org/browser/trunk/dports/devel/cppcheck/Portfile)** static code analysis
 * **[mp3cat](https://trac.macports.org/browser/trunk/dports/audio/mp3cat/Portfile)** read and write mp3 files
 
-### 3D Print Designs
+### 3D Print Designs ([Repository](http://xythobuz.de/git/3d-print-designs/))
 
 * [Fabrikator Mini Filament Spool Holder](http://www.thingiverse.com/thing:1427890)
 * [Fabrikator Mini Full Graphics Display Holder](http://www.thingiverse.com/thing:1441146)