Haha, the room with my 3d Printers is the only one off limits for my two one year olds.
They see the printers as toys that will move for hours and I was worried about them hurting themselves in between the moving parts too much.
Depending on your little gremlins abilities to enter mechanical contraptions, you should consider child locks.
Cats are like toddlers that can climb up to the ceilings.
My first cats got quite old happily and now that they sadly passed this year, we got two one year old boys and realise now how active young cats can be. It's so much fun to play with them but they also manage to squeeze themselves into the tiniest places.