KIconMaker

Installing:

clone this repo or download the zip file (https://github.com/Satisfactory-KMods/KIconMaker)
copy it to <your project>/Plugins/.
open the editor and go to KIconMaker Content
open the IconMaker level

Using:

Actions

Export - Automatically name the icon and export it to the path specified in mExportPath.
Hide indicator - Try to find the production indicator and remove it from the actor.

Select the object where we want to create a ICON

mBuildingClass - The class of the build (used only if mItemMesh AND mItemClass is none; set automatically if mItemClass OR mItemMesh not none)
mItemClass - the class of the object (used only if mItemMesh is none)
mItemMesh - if you want to snap a static mesh, use this (automatically set by mItemClass)

Camera (Custom):

mActorRotation - Is for the rotation of the ChildActor (The object you want to create an icon in).
mCameraArm - Sets the distance between the object and the camera
mCameraRotation - is for the rotation around the object
mFOVAngle - is the FOV for the camera
mCameraLocation - to set an offset for the position of the camera (move the arm, not the camera itself)

Light

mLight - is the object for the light (DirectionalLight)
mLightIntensity - light intensity small helper to set the intensity easily in Icon Maker
mSkyRoation - light rotation small helper to set the position easily in Icon Maker

After Export

After export you will get an image that is blue and has an alpha in the middle. Now you have to invert the alpha, for example with Paint. NET or PS. Small tip for Paint. NET : https://forums.getpaint.net/topic/9625-invert-alpha/

After that scale the image to 512x512 (for buildings) or 256x256 (for items),