So recentley I was bitten by the Nixie Bug and startet playing around with them and building clocks, electronics and other things like a madman. Having now partialy recovered (after a sucsessfull Nixie tube clock build) I thought I could save you guys some hassle and share some of my work.
Here is a base for the IN-12 tubes. It is designed to take Nixie pins as found on e-bay
Print the base, get some pinns, insert them into the holes. put in the nixie FIRST and then solder wires!!! important if you solder without the nixie the plastic will melt and the pinns will be missaligned!
The author hasn't provided the model origin yet.