A clock with a chain that rotates around the minute shaft. Once every hour a number will be at the top.It uses a regular quarts motor for wall mounted clocks.The design is inspired by a clock made by Andreas Dober 1993 for Anthologie Quartett.Print one sets of numbers, face plate, one drive gear and one ring gear (optional). The chain is made out of 12x12=144 pieces of links so they speak for themselves.I printed these out on a mendel prusa @ 0.2mm thick with ABS plastic.The chain links are designed with supports added for the studs in the .stl file. Simply break away the supports and ream/drill out the holes so that they are nice and round. Then the links should, with a little care, snap together. The c-c distance is 10mm.The clock motor I sourced form my local hardware store and is made for 10 to 12 mm thick face plates. http://www.clasohlson.com/se/Kvartsverk/Pr341322000 Cut down the hour shaft and fit the drive gear on the minute shaft. I actually managed to fit a 4x8 ball bearing that supports the minute shaft but I think it should work either way.The numbers are glued into the 2x2mm hole in a chain link.Make sure that the chain is free and that the gears are smooth.Enjoy!