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 the spool holders I use: https://makerworld.com/en/models/27532#profileId-24127