The Spool holder used in A1 mini is attached to the Z-axis column and is compatible with most commonly used filament spools.
Introducing: the Bambu Lab A1 Mini – 3D Printer Academy
Bambu Lab A1 mini 3D Printer
Bambu Lab Z-Axis Coupler - A1 mini
Bambu A1 mini AMS lite shelf holder by Expect, Download free STL model
Bambulab A1 Mini 3D Printer, 3Ding India
Bambu Lab A1 external spool mount / holder by redaeq, Download free STL model
Bambu Lab A1 Mini AMS airtight box. Luftdichte Box! New holder. by Macbambi, Download free STL model
Introducing Bambu Lab A1 mini - A colorful gateway to 3D printing - Announcements - Bambu Lab Community Forum
Bambu Labs A1 Enclosure Kit – Clearview Plastics