This is a case for Mini 4WD cars made with a 3D printer. It was ultimately completed as the PTC series, but what is being offered this time is a collection of prototypes (Part 5) from the design phase, where various printing conditions were tried and tested. These are being offered in bulk at a bargain price, so please consider using them if you're interested. ・The details of the final product differ slightly, but the basic functionality is the same, and they can be used without any problems. ・The filaments used are PETG carbon fiber and various others. ・The colors are black/purple and various others. ・Refer to the PTC series, which is also on sale, for the basic specifications. 　Small item case 8 (1 piece) ⇒ PTC4 (lid is the same as PTC1) 　Screw case 10 (1 piece) ⇒ PTC5 (lid is the same as PTC1) 　Nut case 12 (1 piece) ⇒ PTC6 (lid is the same as PTC1) 　Multi-case (1 piece, with cutting mat) ⇒ PTC7 ・As these are prototypes, there may be some localized defects. Please check the photos for the specifications and condition. Since these were made with a 3D printer, there may be individual differences such as layer lines and localized unevenness. Those who are extremely sensitive to the appearance are kindly requested not to bid. Returns and support are not available. Please understand this before bidding.