Filament Spool Stand Riser

I really like the Filament Spool Stand by LightBulb (https://makerworld.com/en/@LightBulb) for storing my spools. I generally store my spools on the top shelf of a book case and any time there are spools behind the front layer I couldn't see them. So I made a riser (with permission) so the back will be high enough to be seen (100mm). The back row also slightly overlaps the front to minimize the space required. You just have to print one riser for each Spool Stand. I did glue my risers together and then the Spool Stands onto the Risers but that is not required. I tried to make the recessed areas/grooves slightly larger so the Spool Stand will rest in them easily. Also made the front edge concaved so the Riser will rest up against the front Spool Stand.