I needed something to put my ductape on. As FreeCAD evolves I tried a new version et voila... here it comes...
As you can see I also did a FEM analysis because I wasn't show if it's stable enough. PLA breaks at a pressure of about 15MPa. I did the simulation with 1kg and it reaches about 12MPa, so it should to the trick. If you make other experiences please let me now.
I also added the FreeCAD file so feel free to adjust it to your needs.