OH! That actually solves a problem I'm having autocrafting with certain Mekanism machines (they don't seem to want to accept regular input and "extra" input on the same face, so attaching a Crafter directly doesn't work). Thanks, that's really good to know.
That's a Mekanism weirdness. Definitely insert into a chest and then pull out into them. If you're running the Metallurgic Infuser, ensure you've tried to enrich the stuff for bonus and then use an exporter to pump them full. Compressed Redstone for example gives 80 instead of 10.
No problem!
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I've actually done a similar thing myself very recently in Regrowth (1.7.10) - I've actually got it set up for multiple machines - so the interface goes into a chest, and then the inputs are pulled out using the Mekanism logistical sorter - you can add filters which can tag items with colours, as well as get them pull out in certain stack sizes I think, there is also a round-robin mode that can be enabled for a particular filter. So I've got redstone (Enriched for the 80 instead of 10 as triaxx mentioned) set to red, for example, and tagged the pipe leading into the "Extras" side of the Infuser with red (just the piece of pipe directly adjacent) and iron set to blue and tagged the pipe leading into the "Input" side with blue - that means that when the items are pulled out, they'll go where they're meant to. I've done the same thing for my carbon, diamond and obsidian infusers, and all are on the same interface, with the items routed to their correct infusers via the logistical sorter. Needless to say for recipe balance, I've told it that the recipe is 1 compressed redstone + 8 iron to make 8 enriched alloy.
EDIT: Needless to say, if redstone/carbon isn't an issue for you, you can just export those (compressed first) directly in instead of having it as part of the recipe, as Triaxx mentioned. I actually did do that for the carbon one eventually.