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The original was posted on /r/factorio by /u/Medical_Lecture_1970 on 2025-05-30 13:47:41+00:00.

You know that feeling? You’ve spent hours meticulously crafting a new section of your factory, everything looks perfect… and then hours (or days!) later, you realize it’s all ground to a halt, or producing at a snail’s pace, because one crucial inserter is pointing the wrong way, buried deep in the spaghetti, or a single underground belt segment is stubbornly unmatched.

I’ve had enough of these tiny mistakes spiraling the balance of the factory out of control. So much so, that I am in the very early stages of a long term endeavour creating a mod aiming to help players spot these happy little accidents :D

What are those seemingly small, easy-to-overlook mistakes, misconfigurations, or ‘silent’ inefficiencies that you’ve made, only to discover them much, much later when they’re causing significant problems?

I’m thinking of things like:

• the classic one way inserter
• missing pipe segment preventing you from liberating the biters
• an assembler not getting its power to assemble
• unmatched underground belts interrupting the string of belt spaghetti