Meet Mark, the Shark! Little fidget toy that's printable in place or in parts (without needing an AMS), Also made it available in different sizes & variations:

• Toy - 90mm: perfect as your desk buddy.
• Magnet/Keychain 70mm : keychain and magnet parts can be adjustable in bambu studio by selecting the negative related part > press S or scale from the top bar menu > Enter your desired dimensions > Slice. The default magnet size I used is D6X2mm (Check BOM below)
• XS - 50mm: Just a tiny shark! (joints are desinged slightly thicker for this one, feel free to scale it up if you prefer this type)