The torrential downpour in Leeds and its surroundings was likened to a monsoon.
Ry-Offset joint managing director Neil Handforth said: "There was so much water that our guttering was over-powered and rain was coming in through the ceilings."
A number of showroom presses were affected, and the firm is having the damage assessed by its insurers.
"We've had humidifiers placed all around the building to combat the water damage to machines, walls and carpets," said Handforth.
Komori in Leeds was also affected, but its factory escaped damage as floodwater was confined to offices.
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