With this mod having stabilized and there being no egregious bugs (that I know of) I have started to think more about balance.

The voidcrafting numbers that I used so far were based on a rough estimate of the "worth" of each item based on its recipe. I have refactored the code and made many of the calculations more explicit in costs.lua. For 1.3.0, most of the changes I have made so far are only when the crafting cost of an item didn't fit the internal logic that I was trying to maintain, so I reduced it to feel more "consistent." I haven't yet tackled the issue of whether or not the whole methodology I'm using is actually that good, but of course that is something I'll have to continue to think about.

The one place I did make more substantial changes was in the costs of military items. Many have been reduced, because supplying ammo more conveniently seems like a good application for voidcraft, and I wanted to encourage players a bit more here. I also figured military items were a good place to test how well some more substantial changes would work in play, because most of these items are going to be end products, so it was less likely to break anyone's base.

I introduced a second round of changes in 1.3.4. Some of the costs of crafting buildings have been reduced along the same lines as other things, but the biggest change I made in this version was a significant reduction in the amount of additional electricity consumption that speed runes cause, which should hopefully make them more desirable to use. I also made a minor tweak to the rocket parts recipe to slightly reduce the amount of random junk it created.

I do have a few suggestions :

1- Make both type of Voidforges more efficient than the Voidworks

I noticed that the Voidforge take 900 kW of fuel, while the Voidwork take 517 kW, and that the Primordial Voidforge takes 4.5 MW compared to the Exalted Voidworks; 3.1 MW. At this point you are better off using the fuel to make electricity, and even more off if you use the neighbor bonus of nuclear reactors (Of which you need one for every Primordial Voidforge, which is a bit too much IMO).

A steam engine can produce 900 kW, which is the same amount of fuel-energy that a voidforge consume. Except that you could feed basically two voidworks with that instead of a single voidforge!

For a vanilla comparison, a Steel Furnace and Electric Furnace have the same crafting speed, but the Steel Furnace consume 90 kW of energy versus the Electric Furnace's 186 kW. So without any modules or beacons, the burner version would be more efficient than the electric version, and I feel this should be reflected for both Voidforges.

2- Module slots for the Primordial Voidforge.

The Primordial Voidforge is supposed to be the equivalent to the Exalted Voidworks, except consuming more power and making less pollution, but no amount of spare nuclear fuel is going to compensate for the four module slots of the Exalted Voidwork.

3- Efficiency Runes

Straight-forward enough. We got Speed Runes, I saw you talking about not wanting Quality Runes, so all that is left is Efficiency & Productivity Modules. And with the Exalted Voidwork consuming 3.1 MW per machine, and often us needing hundreds of them, a way to reduce their power consumption would be nice.

4- Heat

Originially I wanted to put molten metals there, but then I decided that the lava was enough.
Anyway! We can conjure a lot of crap from the Void, so why not just pull some raw heat energy from it and use it on Aquilo? Or to make some steam using a heat exchanger?

5- Fusion Cells

Summon them directly and/or use them in Primordial Voidforges too! The crafting recipe is not restricted to any specific planet after all...

6- Tiberium Mod Compatibility.

I would love to be able to summon tiberium and maybe turn my excess tiberium into flux. Among other things.

7- Prismite Plate Recipe & Carbon Recipe.

It just feel weird that there are recipes that has a chance to make them, but no recipe that has them as the main output.

8- Void Reactor

Because why would it be a bad idea to use the chaotic energies of the Void to power your lamp?
(Might consume Voidflux)

9- More uses for Prismite Fuel

It's in a weird place. Void Fuel/Solid fuel is better than Prismite Fuel for everything except acceleration, but both are used to make Rocket Fuel which is better in every metric, and making rocket fuel is the only use for Prismite Fuel.

10- Higher chance for voidshard summoning.

10% is just too low in practice. Factory Planner tell me that, for 20 Voidworks set to make Void Flux from Voidshards, I would need 2400 voidworks set to summon voidshards. Meanwhile just directly summoning Void Flux only require 80 voidworks.
Considering that its only uses are making Voidgems, basic void science packs, and Void Flux, it isn't worth the 10% chance to summon, and the alternative is to use 12 carbon and 120 steam. And you can't turn coal into carbon before Vulcanus, and there's no recipe to primarily make carbon.

I got no idea why it is 1. everywhere. When I try to edit it the numbers are correct.

Oh, before I forget : Why is the Greater Voidwork the only one we can make in a foundry?

Thank you for the many thoughtful suggestions! I've implemented quite a few of them in 1.4.0.

It's true that the voidforge is less energy efficient than the voidworks, but you can just plop them down anywhere, start cranking out void fuel, and have a completely self-sustaining little chunk of industry, without having to build any electric infrastructure at all. This is especially useful in Void Block, where you may not have the space for a bunch of boilers and steam engines.Also, with the current energy consumption, a voidforge producing void fuel can sustain itself and two other voidforges, and I like this ratio. On the other hand, I agreed that the primordial voidforge could probably use a buff, so for 1.4.0 it now has four module slots, just like the exalted voidworks, and it will only consume 2.5 MW of power. I'm not sure if the resource cost matters much at the point in the game you're building it, but you're right it does seem a bit costly. I changed the recipe so that it costs double everything else and you now get two primordial voidforges per nuclear reactor.

I can't promise anything specific when it comes to mod compatibility, especially if I don't personally use the mod in my own games, but in general, mod compatibility is something that I would definitely like to do once I've got all of the kinks ironed out.

Prismite fuel delivers higher acceleration and top speed in exchange for lower MJs per unit of fuel. This makes it not very good for burner machines, but good for vehicles. Still, I agree that prismite fuel could use a bit of a buff. For 1.4.0, it now only costs 1 prismite to make prismite fuel, but prismite rocket fuel requires 10 prismite fuel. This means the ratio of prismite to rocket fuel remains the same, but you'll otherwise have a lot more prismite fuel available. I gave the top speed a small buff in 1.4.0, too.

Oh, and to answer your other question, the greater voidworks is the only one that can be made in a foundry because at one point early in development it took void flux to craft it so I had its crafting category set to "crafting-with-fluid-or-metallurgy" and I forgot to fix this. In 1.4.0 they're all craftable by hand, in assembling machines, foundries, and electromagnetic plants.

Thank you! Another thing that I just thought of is using Coherence Infusion to turn Void Fuel into 100% Thruster Fuel or 100% Oxidizer, instead of the default 50% chance for each. Not sure how good it would be in practice, but it sounds like something you should be able to use Coherence Infusion for.

Ah, new thing I noticed while trying to make automated uranium ammo for a special Voidship : There is no recipe to spawn primarily U-238 or U-235. Considering that there's recipes for iron plates and steel and gears & copper cables and the rest, I feel there should be a recipe to spawn U-238 directly instead of having to spawn uranium ore and going through centrifuging.

In practice, not all that good, to be honest. The voidcraft recipe is pretty slow, but it's reliable, so you probably just want to let it run and fill up your ship's fuel tanks. The 50/50 chance averages out over time to fill up both tanks.

I added a recipe for U-238 though.