A sandpaper holder, very usefulland precise. I recomend printing the model without any scale transformation, it's up to you. I have tested scaling and it works between 75% and 100% of size model. I hope you like it!You can print the sandpaper holder with any layer height under 0.35mm. I used: -2 shells and 3 top/bottom layers with a 0.3mm layer height. -30% infill with an average of 70mm/s printing speed. Happy printing!!!