This is a very simple spool holder for the ender enclosure. You can atouche it whit zipties inside. if you need it in the other corner you can just mirror it.
enclosure: https://vi.aliexpress.com/item/1005006382307871.html?spm=a2g0o.order_list.order_list_main.504.58d21802IQjaRF&gatewayAdapt=glo2vnm
The author marked this model as their own original creation.