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Odd that, I think it depends on print quality, but the captive nuts for mounting an extruder always stayed in place under the carriage for me, and I could easily remove an extruder in seconds by releasing two bolts on top with an M4 allen key.

Also, I just had a bad experience with the theory of gravity holding a carriage down on this; the PLA bushings on my temporary carriage softened up with the heat of printing ABS, and due to not perfectly calibrating my extruder when I changed it, a little too much plastic was coming out and pushin
g the nozzle up, or otherwise dragging it through in places, on full layers. I ended up holding the carriage down for most of the print, just so that I could get parts to the standard pictured above; practical in the end, yet fugly as hell.
Hoping there won't be a significant force pushing the carri
age up off the rails? Never again.