For folks who are concerned about their calibration. I too am new to 3D printing so I made my wall thickness more than usual, 1.6mm. This allowed me to do a little sanding when i was done and that helped it so that it slides just perfect. I am still trying to get better with calibration as I hope others are as well, but this is a good little cheat to help along the way. Great design Photograaf16, thank you for sharing.