A San Francisco couple and their two cats died from poisoning from carbon monoxide poisoning.

Roger Morash, 35, his wife Valerie Morash, 32, and their pets were found dead inside their apartment in Berkeley, California, on Monday.

The Massachusetts Institute of Technology graduates had died from poisoning due carbon monoxide in their home, a law enforcement source said on Friday.

The couple was using a laser 3D printer that was venting into their residence, CBS San Francisco Bay Area reported.

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Roger Morash, 35, his wife Valerie Morash, 32, and their two cats were found dead inside their apartment in Berkeley, California, on Monday. They were poisoned by carbon monoxide

The couple's bodies, along with their two cats, were found by a friend at their fourplex on Deakin Street (pictured) where the couple had lived for seven years

The couple's bodies, along with their two cats, were found by a friend at their fourplex on Deakin Street, where the couple had lived for seven years, reported the news outlet.

Researchers at the Illinois Institute of Technology warned users against the potential dangers of 3D printers for home use, reported the Chicago Tribune.

When used in industry, the machine's use of lasers on certain types of plastics can emit toxic gasses, including carbon monoxide and hydrogen cyanide.

Researchers at the Illinois Institute of Technology warned users against the potential dangers of 3D printers for home use. Lasers used on types of plastics can emit toxic gasses, including carbon monoxide. Pictured: Where the couple lived in Berkeley, California

One of Roger's former co-workers told KTVU: 'They were modest people, they had great educations, and were clearly very talented.

'But they got up to do their thing every day and they were just the nicest people you'd ever meet.'

The Morash's memorial service was held on Friday and attendants described the two as talented, modest and kind.

After the couple's sudden death, a GoFundMe was started to help with costs of getting friends and family into town for their funeral. It raised more than $15,000 in three days.