Brio or Ikea train track compatable train track turntable. 3 way and 4 way. the printer I use is not large enough for the 4 way turntable, so I will try and re design so that it will clip together somehow. OK I have redesigned the 4 way turntable so that you can print on a smaller table like the MakerBot 2x. use the connectors http://www.thingiverse.com/thing:15165 to connect the two halfs of track together. the connecting part "TT-turntable03" is tapped out M3. So that an M3 dome head bolt can be used to hold the turntable in position. you might have to sand the turntable part around the edges so that it rotates smoothly.