I'm sharing my set-up which uses the Craftsman Versatrack system widely available in North American hardware stores. The spool holder has rollers with bearings and a bracket that accepts a Bowden tube connector, making spool changes outside the AMS quite convenient. The design can also be configured as a 5 spool static rack using ¾ inch Schedule 40 PVC conduit. The design of the AMS shelf can be found here: https://makerworld.com/en/models/167201#profileId-183569