Printed with Inland brand PLA Pro filament in all three colors. Everything fits together nice and snug however it is a bit tough to remove the red top as the small ridges from printing hold things fast, a little sanding or adjusting the scaling by 0.5% should take care of that. (edited)
Well-designed, fast printing (5m on a K1) hook for small items like LED keychain lights, small keychains, or Bluetooth earbuds/shockz headphones. Approximately 1/2" x 1"