Step 1: download and install prusaslicerStep 2: when you first open it, it will ask you for configuration.#1. select your printer. In our case, we will add creality Ender 3 V2#2. then click next to get to filament window. First select your printer, then select PLA filament. And then check if your filament is in the presets. Otherwise select Generic PLA.#3. under file association, select associate .3mf files#4. on the view mode, you can select simple mode. Step 3:Now click finish and open up the model that you want to print. In our case its two wheeler mid base. #1. change the printer to ender 3 V2#2 change the filament to your type#3 change the print settings to one of the presetsIf the window pops up about unsaved changes, select "discard"Step 4#1. Click arrange in the top of the window, so it positions the model in the center.#2. click slice#3. export it and print :)