Please enable the use of Quality modules in at least the 3rd level of reverse factory building.

The quality grind is brutal.
OP? Yes.
Awesome? Also Yes.

Maybe make it a config flag the player/server can set?

I've noticed that the vanilla scrap recycler allows quality modules, so I've allowed quality modules for all tiers by default (vanilla balance), as well as added settings to modify the allowed modules.

I did nerf the max module slots though, so tier 3 lines up with the vanilla scrap recycler (4 slots). Even at base quality, having 6 Quality-3 modules would result in some products being TWO tiers higher than the original item. Using higher quality.. quality modules would probably be even more broken, so this seemed to balance things out.

"would result in some products being TWO tiers higher than the original item."
Everything about that statement is awesome.

Please allow a mod config for module slot count as I have a world with with the tier 3's with 3 modules already.

I probably should have expected this response lol. Made a setting to un-nerf the module slot count back to the original 2,4,6 in v9.0.6

Here's the related image btw (after feeding them 50 iron chests at 25% efficiency, which always produces 2 iron per recycle):

Do you not know how quality works?
Quality modules give a % chance of a higher quality being crafted
So lets say you have a assembler maxed at 24.8%
24.8% you will get a higher quality, of that percent, 10% will be 2 tiers higher, of THAT 10% will be 3 tiers higher and of that 10% will be legendary (if crafting normal quality).
Basically 24.8% chance of higher quality (usually uncommon ..), 2.48% of 2 tier jump, 0.248% of 3 tiers, and 0.0248% of Legendary.

Ahh, I see. So it's supposed to be improbable, but not impossible, at the lower percents, and only becomes noticeable after a certain point.

Thanks for the info, I just assumed it was locked to only one tier up since that's all I ever got in my testing. I haven't actually gotten around to playing with Quality very much (my beta test playthrough ended after Fulgora, then went straight back to modding)

Just making sure... this is a user setting, right?
Not all of us want "please make the game easy" mods.
I've used this mod a lot in the past, but with the new Quality mechanic depending heavily on not getting everything back in your recycling recipe, I'm very curious how this mod will affect the game now. I find the Quality stuff very challenging but not impossible. It's a really good late-game challenge because the rewards are very nice while being seriously challenging to achieve.

you can control the mod via settings pretty easily.

Of course, all settings are user-modifiable, and the defaults should be as close to balanced as possible, when compared to the vanilla scrap recycler. Specifically, default efficiency was changed to 25% return on ingredients in Factorio 2.0, to match the vanilla recycler.

Just to clarify: default settings are 25% efficiency, Quality Modules allowed, 4 module slots at the highest tier (all matching the vanilla recycler), and fluid ingredients recycle into solid variants (this is the only additional feature under default settings), when comparing stats. In terms of crafting speed, they're difficult to compare, because it also relies on the speed of the recipes, and I think the Reverse Factory was slightly slower in some cases, though equal in most.

The only other change is that with Space Age enabled, Reverse Factory can only be crafted on nauvis, and can only be placed on planets excluding Fulgora, for obvious reasons (although I might have excluded vulcanus as well, still need to see if that had any balancing issues, I forget why I excluded that one). Oh, and also the tiering structure that restricts recycling of most intermediate items (like circuits and engines and gears), preventing productivity looping (recycling an item, then re-crafting it with prod bonus to recycle again and get more ingredients back) until unlocking the tier 3 machine.

So overall, should be relatively balanced by default (and of course, settings are available to break it as much possible, playing both sides of the fence)