I find it quite difficult to load a new spool with MMU Tower Print Buffer so a I designed this simple addon that connects the tubes. The hole for the PTFE is an angled so it can snap with its pair
For 5 pairs of connectors, you need 10 small magnets ( 3mm diam, 1.5mm height - 2$ on aliexpres).
I printed them with 100%infill, 0.2 layer height, in transparent PLA.
The magnets can be pressed into place using a plier:
I recomend using an m4 drill ($5 on aliexpress) to clear the hole of stringing and ease of insertion by rotating the connector on the PTFE tube:
The author marked this model as their own original creation.