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Newer codices are much barer on the minutia. The 5th and 4th edition books go into much more detail.

I just read the 5th edition codex
-Masters of the forge and tech priest are only mentioned doing repairs and getting their training from the cult of mars. They are good at it repairing armour and engines for hundreds of years but no production of new stuff is mentioned here.
-The salamanders have a precious relic of the past, their forge ship with a working manufactorium, producing weapons. (This is mentioned as a great gift -> and is thus an exception).
-The raven guard home planet is mentioned to have the production capacity of a small forge world. Producing enough so that they never have shortages (This is mentioned as an exception to the other chapter) -> Checked the planet and and they build their base on a Adeptus mech forge world and the forges are still run by the cult.

There is not even a conflict in the fluff I found in the 7th, the 5th edition codex and the Mecanucum nove where it is an important plot element that most of the SM chapters can't produce anything themselves. So I'm calling the whole Space marines make their own stuff myth busted.unless you can supply enough page numbers of reliable recent sources to cast any doubt on the sources that point in the other direction .

Organic prosthetics and other techno-organic technology are considered tech-heresy, and solely practiced by the Dark Mechanicum.

Posting a comment like that without refering to a source should be concidered tech herecy.

 oldzoggy wrote:
Posting a comment like that without refering to a source should be concidered tech herecy.

Unfortunately, I haven't been able to find a direct one. There are many implicit sources that I could find on Lexicanum and similar, but the only direct source I know of is 1d4chan. A useful and amusing resource to be sure, but not one known for its citations. Trust me when I say I looked, I'm sure the comissariat will understand.

 asorel wrote:
Organic prosthetics and other techno-organic technology are considered tech-heresy, and solely practiced by the Dark Mechanicum.

 asorel wrote:

Unfortunately, I haven't been able to find a direct one. There are many implicit sources that I could find on Lexicanum and similar, but the only direct source I know of is 1d4chan. A useful and amusing resource to be sure, but not one known for its citations. Trust me when I say I looked, I'm sure the comissariat will understand.

That's because it's flat-out wrong.

Ibram Gaunt has a vat-grown replacement hand, for a start.

For another, without techno-organic technology, mind-machine interfaces like those required to operate prosthetics, titans, dreadnoughts and space ships are impossible.

... not to mention all of those additional organs and implants in Space Marines.

Ibram Gaunt has a vat-grown hand, as noted.

Also, in the Inquisition War trilogy, a 'synthmuscle' hand is regrown for an Imperial Fists character - he lost his battle brothers in a fight in a way he felt was his fault and responded by dissolving the flesh of one hand in acid and then scrimshawing their names onto the bones of his hand, then seeking medical attention.

For the most part, bionics seem to be more common. High-end biotech does exist (like juvenat procedures) but as noted it seems to be rare - largely because people outside the Adeptus Mechanicus and the Astartes don't have it, the Adeptus Mechanicus have a bias towards Augmetic/Prosthetic machines, and the Apothecarion don't like messing with 'Pure' astartes biology.

It's also worth noting, that there are many differnet clones of Fabius Bile running around. Might be tech heresy, but he knows how to get it done. It's why he's allowed to do whatever he wants by the rest of the legions, he helps them with their recruitment.

Juvnant treatments are actually quite common. Anyone with money can get them, with varying degrees of effectiveness. Most high ranking or rich humans in the imperium can expect to live for several hundred years because of this.

In the original Space marine novel, the main character put his hand in acid to scrimshaw the bones, they have to regrow the hand with flesh.

I assume the cybernetics are really temporary and between wars the cybernetics are replaced with grown replacements but it depends on the technology levels of the chapter i think.

Organic replacement parts are readily available.

It is indicated that bionics are not "better" than the organic version, though sometimes potentially stronger, they aren't as dextrous.

Marine physiology are powerful enough to match the effects of most bionics. The 40k universe allows for both and seems to accept that they are essentially interchangeable.