This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
Creates a serigraph (silkscreened) print effect. Can also produce a marker render effect by using the Darken with higher Blur settings.
I based the Smooth/Darken function on uberzev's filter Maximum/Minimum
serigraph silkscreen art print marker
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.