Any building/table that uses a s.a.l. crafter doesn't get maintained automatically. I have to manually send pawns to a machining table or fabrication bench to maintain it. To be clear I am using a bunch of other mods, without posting the entire list I think the ones that may be affecting this is "fluffy breakdowns" and maybe "turn it on and off repower". I think the fluffy breakdowns adds the maintaining mechanic, I can't even remember how it worked without that mod now.