MPCNC Filament Spool Holder

Filament Spool holder for MPCNC with easy release clamp.
The Filament Spool should be above the Machine. It can be fixed to the edge of the table.
The threaded rod is 8mm in diameter and about 15cm long.
2 Bearings are something like 608-2RS 608 RS (8x22x7).
The pipe diameter is 15mm, but I included OpenSCAD file for customizing it.
Variables:
Pipe_D - is the diameter of pipe.
Holder_Height - height of the base part
PART - what part to print (0-4).

If you find that clamp is too tight,