D type pulley wheels for 3D printers.Now replace worn off/stuck bearing pulley for your 3D printer with these pulley.

These are Heat Bed Spacer Spring for Creality 3D Printer for the base of the heat bed. Their function is to level and cushion the base.

These are Heat Bed Spacer Spring for Creality 3D Printer for the base of the heat bed. Their function is to level and cushion the base.

This is the outer plastic wheel for your 3D Printer Pulley. If your bearing is working fine but the outer plastic is damaged or worn off, then just replace this outer cover instead of the whole pulley.