First off, very good job!!.. This was a very educational project for me. I'm new to the 3D world, I learned a quite a bit doing this. everything was spot on dimensionally once the filament was dialed in. I found using a left- and right-handed deburring tool to remove the burrs in the lower track to work very efficient at getting rid of them, then drag the file through it. take yer time with the prints. I look forward to more from you master creator. the color scheme is from the 4Th Dr. Who, my machine choked while making the main risers and I didn't have enough of one color to finish so this is an homage to his scarf. (edited)