Are techprints biased towards ones you don't have yet?

[YokoZar]

It could be random chance, but I feel like I kept seeing the same techprints for sale until I bought and used them, then I'd see different ones (and not the original ones).  I've yet to see one I've already used.

Am I just lucky, or is the game being friendly?  Has anyone tested explicitly?

[Shinzy]

It certainly seems that way! on my latest play through exclusively received tech prints that I hadn't already learnt through quests and traders.

So it's def not by random chance that you're getting so "lucky" with them

[RawCode]

Code Select Expand

private ResearchProjectDef FindTargetProject(Slate slate)
{
if (this.fixedProject.GetValue(slate) != null)
{
return this.fixedProject.GetValue(slate);
}
return (from p in DefDatabase<ResearchProjectDef>.AllDefsListForReading
where !p.IsFinished && !p.TechprintRequirementMet
select p).RandomElement<ResearchProjectDef>();
}

quests will give as reward only techprints you can use

[khun_poo]

So, tech print will not spawn the tech that already unlock? It's annoying to close the trade panel to recheck again all the time.