3/4" U Barb
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Download folder: File:Upipe.tar.gz
U-barb for making tight u-turns with 3/4" irrigation pipe or other poly pipe. Poly pipe should be heated to allow easy application. The current application is u-turns for 500' of 3/4" black poly tubing - a 3.5kW heat exchanger for heating aquaponic ponds on solar radiation and some heat from the ceiling of the greenhouse.
Notes:
- STL file is the printing file. It has a thick wall.
- File was generated and exported from FreeCAD.
- The Sweep Tool was used in Part workbench. A circle was swept along an elliptial line. Since only solids and shells are possible using this tool in FreeCAD, I created one solid, and a smaller solid, then subtracted them. This worked by merging the solids into the final FreeCAD file. The only way this worked was when I cloned the solid BEFORE merging the two files. Otherwise, a merge of a non-cloned entity did not work. It was not sufficient to create a solid - only a clone of the solid worked for the Boolean operation.
- This worked for the original 2 solids. Then I tried a larger inner solid (to make a thinner shell). That did not work for some reason. You can play with the files above to see if it works for you.