Scaling issue when exporting to .stl

I've created a few shapes that have a critical measurement of 34mm on one part. I made sure Tinkercad was on mm. and set exactly 34mm. I then exported to Replicatorg to print and found out the piece to be 31.5mm, so too small. There are two cylindrical shapes that need to go inside of each other and they are both too small but match perfectly. I've done the calibration cubes from Thingverse and they are pretty much spot on. Seems like there is a kind of a mismatch between Tinkercad .stl and ReplicatorG. I'm baffled about this and would love advice. It's costing too much to print a part and needing to re-scale afterwards. 


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