It seems my design for the beefed-up Hudson bogie was a little two ambitious.
Two failed casting attempts from the new mould have convinced me that it's not going to be reliable enough for a production run.
If I just needed to get a couple for myself I could persevere until some came out properly but that's not viable.
The idea of having a one piece casting was a nice one but the axle box parts are too thin for the undercut details to cast properly.
I poked a cocktail stick around when the resin was poured but was never possible to chase out all the air bubbles.
So I've reverted to Plan B which is to cast the side frames and axles boxes as separate, flat pieces to be glued onto rather basic skeleton.
I'll be a little more fiddly to put together but I'm hoping it'll be just as effective.
Must admit I came to the same conclusion as you some years ago with 7mm scale bogies too.
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