Why to print spool sidewalls when you have hundreds of useless CD's? Print the CD_spool file, add 2 CD's and this is a cable spool for general use. Add CD_spool_b in the center if your material must not bend in a small radius. In this radius you can use it for 1.75mm ABS filament. This bobbin has a hole to fix the end of filament. Do not use for 3mm PLA: this filament is hard and will break after some days.

Print 2pcs CD_spool3 file for a spool with 2 chambers. Assemble in the mid of a cable and you can wind the cable while it is plugged. Use optional CD_spool3b if you need a bigger radius for cable. Glue is optional, I have not used. Printed in ABS or PLA, as you have. Center hole is for 8mm rod of a spool holder, optional. Gaps for CD have to be precise. Clean with a precision knife.