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 2) from the design phase, where various molding conditions were tried and tested. These are being sold 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 features are the same, and they can be used without any problems. ・The filaments used are ABS/PETG carbon fiber and various others. ・The color is black. ・Refer to the PTC series, which is listed separately, for the basic specifications. 　Small parts case 4 (2 pieces) ⇒ PTC1 　Battery case (holds 16 batteries, large size, 1 piece) ⇒ PTC3 　Nut case 12 (1 piece, no lid) ⇒ PTC6 (lid is the same as PTC1) ・As these are prototypes, there may be some localized defects. Please check the specifications and condition in the photos. Since these were made with a 3D printer, there are individual differences such as layer lines and localized unevenness. Those who are extremely sensitive to the appearance should refrain from bidding. Returns and support are not available. Please understand this before bidding.