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So far i printed a few parts (i print on an Ultimaker Original+) including a corner block in PLA.
But i get an inner diameter of about 24.5mm for the IE version. The stange part is that the outer dimensions of the part are exactly the length cura shows me. (48.4mm x 53mm x 53 mm).
Because i dont got my ballbearings yet i just printed out 3 dummy with and OD of 22 and put them in the middel joiner and this part fits the tube just fine.

So i am undeterminded if i should just sand out them corner blocks to fit my tube.