These are generic 3D printable mining conveyers in HO (1/87) and N (1/160) scale. The conveyor models comes in three different variations (covered, corrugated, uncovered), two lengths (short 9-10cm and long 40cm+) , plus an optional walkway. If your printer can’t handle printing a long mining conveyor, the short pieces are modular and can be glued sturdily together using reinforcement from the printable inner top and bottom conveyor belt. Also included is an editable Sketchup file for those who wish to edit or modify the models.