Preparing: 225 x 53 x 3 mm transparent polycarbanate glass Can lid with approx. Ø 70-75mm Sandpaper 1 Phillips screw Ø 4 x 20 mm 1 washer Ø 4,5 x Ø 12 mm Phillips screwdriver Fretsaw (fine saw blade) If you don't have polycarbonate glass available, you can also print the cover (PencilCase_cover.stl). Step 1: Preparing Sliding Cover This first step will show you how to make this sliding cover. Of course it is easier to print it. But I like a transparent one better. For the the polycarbonate lid you need: 225 x 53 x 3 mm transparent polycarbanate glass Can lid with approx. Ø 70-75mm Fretsaw Sandpaper After you have cut the lid, you must saw out a kind of recessed grip on one side. To draw in the rounding I took the lid from a tin can. The diameter of the lid should be between 70 and 75 mm. After sawing out the rounding, you must carefully break all the edges of the lid (grind them round). Step 2: Assembly Next, those two parts must be printed first: Pencil case_bottom.stl Pencil case_top.stl Further you need now: 1 Phillips screw Ø 4 x 20 mm 1 washer Ø 4,5 x Ø 12 mm Phillips screwdriver First test whether the sliding lid fits and can be pushed without any problems. If it is too difficult to slide, you will have to grind the edges of the lid to fit with sandpaper. Now you can screw the top part (Pencil case_top.stl) onto the bottom part (Pencil case_bottom.stl) with a Phillips screw Ø 4 x 20 mm. To prevent the screw head from pressing into the material, use a washer Ø 4.5 x Ø 12 mm. Tighten the screw only so tight that the top part can still be turned. Now push the lid into the upper part. That's it! The pencil case is complete!