FIDO - Felines In, Dogs Out - Door holder / prop / latch

Keep dogs out while letting cats through. Just slip FIDO over your door knob (or lever) and latch it into place. You can adjust the latch based on the relative sizes of your cats and dogs. Even if you're not trying to keep a dog out, FIDO is a great way to compromise with your cat who hates closed doors.

Design

• Holds most doors slightly ajar
• Easy to latch and unlatch from either side of the door
• Adjustable width with satisfying snap-in latch
• Optimized for printing using just 12 grams of filament and no supports

Print settings

• 4 walls recommended for strength of the latch piece
• Tested with PLA and PLA+, but would also work great in PETG or other non-brittle filaments