Helpful reminder and great print size/image size break down from Photo Focus:
The easiest solution is to print an image size that matches your pixels. For example, if you want a standard 5×7 print, the image needs to be at least 1500 pixels wide and 2100 pixels tall. The formula is multiplying the inches of your print by 300. So for our 5×7 print, you multiply 5 by 300 to get 1500, and 7 by 300 to get 2100. Instead of doing the math, you can always follow this chart.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.