Prusa Research i3 MK3S+, Manual

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8. Electronics assembly
130 Original Prusa i3 MK3S+ kit assembly
STEP 42 Mounting the double spool holder
To properly mount the spool holder, let the "tooth" sit on the frame (in the middle)
and then press in the direction of the arrows (push backwards, while slightly
pressing downwards).
Don't try to assemble spool holder by pushing it only from the top. More force is
needed and you may damage the holder.
STEP 43 Gluing the silver label
WARNING: This step is important, don't skip it! The silver label includes the
printer's serial number and other important information. Its presence is necessary
for any warranty claim. In case the label is already on the frame, please skip this
step .
Rotate the printer, so that the rear side with the PSU and electronics faces towards
you.
Locate the part of the frame above the PSU, if possible clean this area to remove
any dirt or grease.
Carefully peel off the protective layer and glue the label on the frame. Ensure there
is no air trapped below the label.