added more part visuals

diff --git a/doc/parts-visual/extruder-fanduct.jpg b/doc/parts-visual/extruder-fanduct.jpg
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diff --git a/doc/parts-visual/extruder-gears.jpg b/doc/parts-visual/extruder-gears.jpg
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index 0000000..3abcd39
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diff --git a/doc/parts-visual/extruder.jpg b/doc/parts-visual/extruder.jpg
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index 0000000..59c36d6
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diff --git a/doc/parts-visual/filament-holder.jpg b/doc/parts-visual/filament-holder.jpg
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