Base for Table Top Spool Holders

I weigh my spools on a small digital scale to help estimate if there I have enough filament left for a print job, and printed some table top spool holders for holding the spool upright on the scale. Laying the spool flat on the scale blocks the display. I wanted to the spool holders to stay in place, so designed a base for this purpose. I added several slots for the retainers so that spools of varying sizes can be accommodated. (For Bambu spools, the retainers go in slots ‘2’ and ‘5’.) These are