Hotbed cable guide-slimmed

This is a remix of the hotbed cable guide for the auto build-plate changer for A1 mini. I ran into a problem where the hotend would bump into the top side of the connection point when leveling the bed, causing print problems, so I narrowed the top side. I also ran into problems where it would bump into the plate stocker. To resolve that I narrowed the sides as well. (Update 2025-10-07)Print in PETG is recommended as the heat from the bed causes the locking supports to sag, causing it to become disconnected.