I search internet for a long time to make one. Couldn't find any. I draw by myself. This parts are exact size of derringer pistol 1:1.
Some parts are so tiny. You may increase scale for your taste. Also main spring and ratchet spring is too thin for print and function. I decided to use real spring instead. Printing tiny screws are meaningless for a small model I used real screws for assembly. For firing pin and trigger spring I used plastic box. It has enough tention.
All parts are functional. Barrel lock and ejector is working as real one.
No Name PLA