Remove the old blade before putting in a new one.
Rotary replacement blades are sold in craft, hobby and discount stores, as well as on the Internet. There are several different brands of rotary cutters, and each supplies its own replacement blade. Some generic brands are also available which list on the back of the package which manufacturer's rotary cutter is compatible with that model blade. Change rotary cutter blades with the appropriate size and model replacement type.
To change the blade, open the rotary cutter. While each type varies slightly, it is simply a matter of unscrewing the outside nut according to package directions and removing the cover.
Carefully avoiding sharp edges, remove and discard the old blade before you put the new one in. Only one will fit within the device at a time. Lint or dusty residue can build up over time with use of textiles, so wipe or blow off the cutter's interior before placing the new blade inside.
When inserting the new blade into the rotary cutter, put it in the right position for the outside pieces to properly fit back together. Then tighten the nut, and the rotary cutter is ready for action.
