2 weeks ago I restarted my world in 1.4.5, I have to say it's pretty similar to IC2, you would need to make low tier things first from the lowest one which is ind. centrifuge to ind. blast furnace tier 1, tier 2(to make the diamond drill that requires titanium).. and finally to the matter fabricator..and now I'm a bit bored because I am only afk-ing in the game waiting for the UUM for Iridium (and you also need gun powders for the Iridium plates, either from vanilla creeper farm or quarrying for saltpeter), but hey at least there's something to reach afterwards(Fus. Reactor)..
It's all the same with vanilla IC2 you have fun until you stuck with AFK-ing waiting for your UUM to produce something (takes around 2-3 days to reach this point) and probably the only thing you can do after you reach that point is making more solar panels..the main difference is that in GregTech you need longer time to reach the boringness of it.... it's like an extension of vanilla IC2, but at least in GregTech I have something to do after the matterfabricator part..
Regarding to aluminium, I always use it for any possible kind of refined iron substitutes, i.e the mixed metal ingot and the circuits.. and probably will use it for other stuff like making the endermen farming using non-solar free energy in the end..and no you don't have enough irons if you haven't reached the end game, multiple full railcraft tanks (9 x 9 x 8 ) and solar panels will still blow your iron resources..I always run out of irons and circuits..maybe because of the enormous amount of solar panels and other stuff :(..
Chrome is fine, you won't need much of it (stacks) to reach the matterfabricator part.. you probably only need a lot of it to make the fusion reactor set up.. and no it's not the end.. there's more to come in the future (Greg's own dimension)..
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First off, let me just say, I'm really happy to find someone who sort of agrees with me. I often feel like I'm just talking to a wall.
I will say that the industrial centrifuge, and industrial electrolyzer are both great machines. They're probably the best part about this mod. But once you start building casings for bigger machines, I really feel that things turn into a trudge for ingredients, and even worse is when you complete the blast furnace only to find out that you need to make it better before it actually becomes useful. (If you don't have Metallurgy or Railcraft, this is your only source of steel though, which sort of justifies it, but Greg has already implicitly endorsed those mods by requiring the rolling machine, and by making Metallurgy metals dust-compatible.)
When I first griped about GregTech many pages back, it was just from looking at the recipes. I hoped that once I actually made one of the big machines like the Matter Fabricator, the catharsis from achieving that would make it worth it, and motivate me to get to the next machine. It did not. The feeling from getting the Matter Fabricator was 'wonderful. I guess I'll just leave that here then.' And now I just wait for UU-Matter to accumulate.
Aluminum is definitely nice for mixed-metal ingots, but only because you get more out of it. I currently have enough iron for whatever I'm doing due to pyrite dust, so it doesn't make sense to substitute it elsewhere. Although it helps that I already have a tank, and I'm not using solar panels (Just because geothermal is more convenient for me.)
Agreed, I only needed eight chrome ingots to make the Matter Fabricator, that wasn't so bad, especially when I found out I could use redstone to get the ruby dust. But the fusion reactor is just unreasonable. And it's all or nothing. It would be so much better to have the fusion reactor follow the blast furnace's design, with the fusion reactor on its own still being able to operate, and then additional coils increases the amount of recipes you can use.
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Here are things I think need to change:
Two tiers of fabricators: The first functions as the matter fabricator does now at default config, only accepts scrap, requires scrap to run, produces UU-Mass, and should be about as difficult to make as the mass fabricator. The second requires 1/100th of the energy that the first does, can accept many different forms of amplifier, though it still requires it to run, produces IUU-Mass, and is as difficult to make as the matter fabricator.
UU-Mass functions almost identically to UU-Matter did in vanilla Industrialcraft 2. IUU-Mass produces extra amounts of mundane items when crafted, is capable of producing the GregTech gems and dusts, and can be crafted with other items that act as a catalyst. (Instead of 9 UU-Matter for a diamond, you can use a coal + 8 IUU-Mass surrounding it, or something to that effect.)
I've already discussed the changes that need to be made to the fusion coil.
Make the spending of iridium worthwhile. Iridium should be used because it's indestructible and the item calls for it. Why does a 'data control circuit' require an iridium plate? To make it arbitrarily more difficult to make? I understand the quantum armor, and the iridium neutron reflector, and even the superconductor, as iridium is, in fact, a super conductor below certain temperatures, but a 'data control circuit' doesn't sound like it merits one.
Which leads me to my next point. More uses for aluminum. Instead of aluminum machine blocks, let an aluminum block get pressed into a plate and used as a substitute for iridium plates in items that simply don't need indestructible material or a superconductor. Aluminum armor and tools would be fine too, as it's a light, strong metal.
And I know I already brought this up ages ago, but I think multiple tiers of lightning rods would be rather enjoyable. (Specifically, two lower tiers.)
Oh, and let casing be upgradable. Some recipe to go from standard to reinforced to advanced would, I think, make things nicer.
Now, as far as new things are concerned, I only have one suggestion: Industrial Recycler. Let people recycler entire stacks of items, yielding 12-20 scrap, taking eight times as long as a regular recycle operation but consuming 64 EU/t.