... digital calipers. 3 or 4 thou isn't much of course, but with the latest clip-fit chairs I can just detect some endways freedom in the socket. That's not likely to cause a significant gauge error in 00 and EM, but it might do for EM-SF and P4. Increasing the shrinkage allowance should prevent that. On the 3D-printing web sites the suggestion is around 6%. I can't see any evidence of that much shrinkage for our tiny chairs in 4mm/ft scale, but there might ... for the bulkier 7mm chairs, and there is definitely a lot more shrinkage on the tweezer tip shanks and knuckle bend gauges. cheers, Martin.____ message ref: 7498. The new clip-fit chairs locate very easily into the FDM timbering base sockets. So now the bottleneck moves from pressing chairs into sockets, to getting them cut from the raft and placed into the sockets. The pin-slotted chairs without the outer jaws are a bit more fiddly to handle than the chairs with solid jaws. ...