2.4. SIMPLE MODE
would sit the print in the middle. Should it be desired to print away from
the center, because of a scratch in the glass perhaps, then this option should
be used.
Z offset can be used to compensate for an incorrectly calibrated Z
end-stop. If the nozzle stops slightly too far from the bed, then adding a
negative value will oset all layers by that amount. The correct solution
however is to x the end-stop itself.
The optimal Z end stop position is where the nozzle tip barely touches
the surface of the bed when homed. A sheet of paper makes a good gauge
for this very small distance. It is not recommended to use this setting to
try and improve layer adhesion, by “squashing” the bottom layer into the
bed, instead look at the suggestions in subsection 2.3.
Firmware. As selected in the wizard (see p.63), G-code flavour denes
the dialect of G-code generated.
Extruder. Nozzle diameter was dened in the wizard (see p.65).
Retraction. Unless the material being extruded has a very high viscosity
it may ooze between extrusions due to gravity. This can be remedied by
actively retracting the lament between extrusions. Setting the Length
parameter to a positive value will cause the lament to be reversed by that
many millimeters before travel. The retraction will then be compensated
for by the same amount after the travel move, before starting the new
extrusion path.
A value of between 1 and 2mm is usually recommended. Bowden
extruders may need up to 4 or 5mm due to the hysteresis introduced by
the tube. Setting the Lift Z parameter to a positive value will raise the
entire extruder on the Z axis by that many millimeters during each travel.
This can be useful to ensure the nozzle will not catch on any already laid
lament, however it is usually not necessary and will slow the print speed.
A value of 0.1mm is usually sucient.
Start, End and Layer Chance G-codes. Custom G-code commands
can be run before a print starts and after a print nishes.
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