Spool holder for Prusa i3 Hephestos

The support is based on a design of "hackele" (this is a remix).
Both of the arms are identical to the original but the shaft is completely new. Now is a cylinder. It is easy to put and remove the spool over the arms using your fingers into the cylinder.
Cylinder length 112mm; 132mm; 152mm
Added 114mm and 144mm.