Copied from the Apskeppet/picoCAD discord. Mainly written by OM3GA (https://bsky.app/profile/sassy0m3g4.bsky.social). Slightly edited.

For this walkthrough we’ll assume:

• You already exported your PicoCAD proyect into an .obj file using the toolbox
• You already imported the .obj into blender
• You also have your texture image file at hand

I´ll go over the process with this here kitty. Which I already imported into blender.

• With your object selected, look for the shading tab.
• Inside it you will see the node editor on the bottom half of the workspace.

• we just want to make sure our cursor is in the node area.
• Make sure nothing is selected (none of the boxes/nodes have a white/orange outline)
• then: Right Click -> Add -> Search -> Type in: Image texture

• That will bring forth the "image node"
• Which you´ll promptly connect into the "color" aspect of your "principled BSDF" node which governs your model´s texture/material