Spool Insert For Polymaker Cardboard spools

Had a spool of Polymaker filament fall apart so rather that have it go to waste I made a insert spool spacer to hold the spool together. I am new to CAD and used Tinker CAD. let me know what you think. Uses 8 M3x10 screws to hold it together, may need to open the holes on the outer pieces a little bit.