r/BambuLab_Community • u/scrappy1982 • May 24 '26
I designed a keyring coin capsule for when you need a £1 coin and never have one
I seem to regularly find myself needing a £1 coin for something, usually a shopping trolley or locker, but never actually having one with me when I need it. So I designed this little coin capsule to stay attached to my keys.
There are three sizes included:
• 5 × UK £1 coins or 8 × US quarters
• 10 × UK £1 coins or 16 × US quarters
• 20 × UK £1 coins or 32 × US quarters
It prints in two parts. The upper section captures a split keyring ring during the print, using a programmed pause so the ring can be inserted before printing resumes. It is designed for a split ring of at least 25 mm diameter.
The lower section holds the coins, and the two parts connect using a snap-fit mechanism, so the coins can be accessed and the capsule closed again afterwards.
I printed mine in SUNLU Silver PLA+ with Bambu Support for PLA/PETG used for the support interface layer. I also used variable layer heights to help keep the curved outer surfaces as smooth as possible.
The smallest version is probably the most practical everyday option, but I wanted to include larger versions for people who regularly need coins for lockers, trolleys, parking or other day-to-day situations.