Horizontal spool holder

7 Jun 21 modified centering ring and added optional arms to hold  coils of loose filament (vendor samples). Renamed files to HS_name where HS stands for Horizontal_Spoolholder.

Place all files in a common directory and edit my_common.scad to change the diameter of the centerin piece. save that file and open my_centering.scad and run it to create the custom stl.

uses 4 bearings ( I used the ones from the original mini spool holder), and three M8 x 40mm bolts with nuts. most big box hardware stores carry them.