Installing the driver is only half the battle. You must configure your software (VinylMaster, Flexi, Sure Cuts A Lot, Easy Cut Studio) correctly.
Look for a device labeled "USB-SERIAL CH340 (COMx)" or "Manual LPT".
Do not rely on the old mini-CD that came with your plotter, as those drivers are usually outdated and incompatible with Windows 10. Instead, download the official, digitally signed drivers:
Load vinyl and lock the pinch rollers securely over the grit rollers.
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Install the blade into the cartridge and adjust the depth so it only barely cuts through the vinyl but not the backing paper. Ensure the blade holder is secured in the carriage.
If you encounter issues during driver installation or while using the Cutting Plotter 721 with Windows 10, try:
: Your software is trying to send data to the wrong COM port, or another program is blocking it. Double-check your Device Manager to ensure the COM port number matches your software settings exactly. Try changing the port number to COM2 in the advanced port properties. 2. The Plotter Cuts Random Characters or "Garbage" Lines
If the number is higher than COM4, right-click it → Properties → Port Settings → Advanced and change it to COM1, COM2, or COM3 . ✍️ Step 3: Software Setup Installing the driver is only half the battle
This happens if multiple programs try to access the cutter, or if the port was not properly closed by the software.
Overview
Ultimate Guide: Installing and Troubleshooting Cutting Plotter 721 Drivers on Windows 10
The core issue with Windows 10 is its stringent driver signature enforcement. Drivers written for Windows XP/7 (common for the 721) are often unsigned or use deprecated architectures. Do not rely on the old mini-CD that
To successfully install the 721 plotter driver on Windows 10, follow these primary steps: Software for JinKa JK-721 plotter - PlotCalc
Extract the downloaded file and run SETUP.EXE .
Common Issues & Resolutions
Restart your computer and ensure only one cutting application is open. C. Cutter Moves But Doesn't Cut Properly (Garbage Output) This is usually a Baud Rate or Flow Control error.