Project not showing all details when cutting

I am using a Two Trees 20W diode laser with a MacBook Air. I downloaded a file for some towers for a table top game. The file shows all the correct sizes and details but when I cut/engrave, it leaves several important parts out and cuts the files both too big and too small.

This is the file I used. Level 3 medium octagonal building for 3mm laser cut MDF by Bilbostomper - Thingiverse

The project looks like this when I finished. They are completely missing the cutouts to allow the pieces to fit together. The cut outs for the base are too small to fit the grooves from the walls.

I’ve included pictures of my final project and screenshots of Lightburn and my settings. The settings are the same for both cut lines and then the same for both engrave lines. I am using air assist on the project set fairly high. The material is 3mm basswood

I have searched and searched for what I am doing wrong but I’ve not been able to figure it out. Any advice would be greatly appreciated!



Looks to me like you have a kerf offset applied.

That worked perfect! I knew it was something minor and I was just not able to find it. Thanks

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