2.3. FIRST PRINT
Fatter extrusion width. The more material touching the bed, the
better the object will adhere to it, and this can be achieved by increasing
the extrusion width of the rst layer, either by a percentage or a xed
amount. Any spaces between the extrusions are adjusted accordingly.
A value of approximately 200% is usually recommended, but note that
the value is calculated from the layer height and so the value should only
be set if the layer height is the highest possible. For example, if the layer
height is 0.1mm, and the extrusion width is set to 200%, then the actual
extruded width will only be 0.2mm, which is smaller than the nozzle. This
would cause poor ow and lead to a failed print. It is therefore highly
recommended to combine the high rst layer height technique recommended
above with this one. Setting the rst layer height to 0.35mm and the rst
extrusion width to 200% would result in a nice fat extrusion 0.65mm wide.
Bed material. Many options exist for the material to use for the bed,
and preparing the right surface can vastly improve rst layer adhesion.
PLA is more forgiving and works well on PEI, PET, Kapton, or blue
painters tape.
ABS usually needs more cajoling. While it’s generally preferred to print
directly on the PEI surface, a watered-down PVA or white school-glue
solution can help prints adhere to the bed and is preferred. Never use
anything with acetone on the PEI print surface as it can degrade the PEI
material.
No cooling. Directly related with the above, it makes no sense to
increase the temperature of the rst layer and still have a fan or other
cooling mechanism at work. Keeping the fan turned o for the rst few
layers is generally recommended.
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