Sometimes all you need is a little "NUDGE" in the right direction.

I've just taken a look at the start and end codes now, the printer is currently running a job so I can't test any changes, but having now looked I see the answer is somewhat obvious.

There is a G1 code moving the bed down 50mm at a slow feed rate, so I can simply remove this (and the relative G91 code on the prior line) - and then lower the bed manually as I wish.

Start code...

G21; set mm units
G90; set absolute coordinates
G92 E0; reset extruder distance
G28 X0 Y0;home x and y axis
G1 X100 Y100 F4000; move Nozzle above bed
G28 Z0; home Z axis 
G92 E0; reset extrusion distance
G90

End code...

G28 X205 Y200
G91
G1 Z50 F50

Ah, so that prior experience with g-code has come in helpful indeed!

Thanks for the idea, I didn't know you could edit the start and end code seperately in Repetier, but quickly found you could after you asked for the codes.

Many thanks!

First post of these forums... I've recently begun using my SD4 on a different PC, and have been experiencing a somewhat annoying moement of the Z axis post print.

When a print finishes, or I kill a print - the bed moves down about ~50mm, but awfully slowly - and there's nothing I can do about it but wait, so if I'm tweaking settings - I've got to waste a couple of minutes, over and over and over...

I'm using Repetier Host & Slic3r. This actually happens on any PC I try.... other than the one I've been using for a while.

Any ideas how I can stop this? Once the print finishes, I'd like the hot end just to go park itself in the corner, and not waste my time by moving the Z axis so slowly....

Thanks in advance!