customizable pipe joint

Joint for 20mm (by default) plastic pipes.
You can easily modify:
* amount of pipes to mount
* diameter

I wanted to use it to build small stack-able green grow farm. I build the rack, than found out I have no hand for microgreens :)

Python script can be used in blender to make printing the joint easier. To do so:
* grab all points you want to move to ground level
* run script on them