FreePipe splitter and adapter (from one ID 13mm pipe to five ID 4mm pipes)
Thingiverse
7 model
Free
FreeMKIII Wind turbine 50mm pipe adapter
Thingiverse
Free100mm exhaust pipe window adapter
Thingiverse
Free120mm Fan to 110mm pipe adapter
Thingiverse
FreeGutter Splitter Y-pipe water drain adapter
Thingiverse
Free60mm Fan to ABS 1.5 Pipe adapter, for enclosure
Thingiverse
Free5015 Blower Fan Adapter with Flexible pipe (Hose)
Thingiverse