I made a Single Sided Universal Filament Spool Holder, you can load and unload with 1 hand! : r/prusa3d

Spool Holder adjustable with bearings for Prusa i3 MK3S by JuraS, Download free STL model

MK4 - support for filament holder to reduce wobbliness, link in comments : r /prusa3d

Gravity spool holder for MMU2S - DEMO

MMU3 Review : r/prusa3d

Switching from the buffer box to the gravity spool holders made it go from a ton of user and interventions to only 1 (that was my fault). Even better than the auto-rewind

double spool holder stl – Hardware, firmware and software help – Prusa3D Forum

MMU3 Review : r/prusa3d

MK4 - Universal direct spool holder with ball bearings by nice_3d, Download free STL model

MMU 2.0 Spool Holder. Filament loading/ unloading

Universial Horizontal Spool Holder for the Prusa mini base by RasmusG, Download free STL model

Prusa MK3 Spool Holder Side Mount Adaptor by INeedOneDesigns, Download free STL model

Filament Holder with Single Bearing Spool Modification

3D Printable The Ultimate Horizontal Spool Holder for Prusa Printers by Stefanos Karagos

MMU3 Review : r/prusa3d