Hi jason,

> as I've only really had issues converting models
> from this same client.

Probably that one particular client is building things at a somewhat unusually large scale or they are using somewhat looser tolerance settings in the program that they are building it in, making gaps between pieces that are larger than MoI's join tolerance.

But in either case doing a scale down followed by join can help, because when you scale objects down the gaps between surfaces also shrink and once they get below 0.005 units then they should get joined when using the Edit / Join command.

- Michael