Most of the "problem" can be explained by idea/physical differences. Axles are a bit shorter physically than ideal (between 1.2 and 2 ldu depending on 6L axle measured), stud height with logo is 4.5ldu instead of 4 (generally it doesn't matter, but here two of them are head to head), and stacking introduces some more play...
I had the opportunity yesterday to participate in the dismantling of a huge (275000 pcs) MOC, and I learnt that between the core made of stacked bricks and the "skin" made mainly with plates there was a height discrepency of a half plate...
I had the opportunity yesterday to participate in the dismantling of a huge (275000 pcs) MOC, and I learnt that between the core made of stacked bricks and the "skin" made mainly with plates there was a height discrepency of a half plate...