I created this tool caddy to clip on the left or right side of the Flashforge Creator Pro cutouts. Accommodates calipers, scissors, spatulas, box cutter, pens, screw driver and a few other similar accessories.
Designed on tinkercad.com - Print upside down on print bed / no supports / 5% infill / high quality / 2 shells / 0.3 layer height / PLA material at 215c / 45mm/s while extruding and 75mm/s while traveling. Printed on Flashforge Creator Pro.
EDIT: You might have to add a couple of small spacers on the back side (I used a small rubber foot with an adhesive back) - this will help the unit hang more level - I designed with a little too much gap on the part that hangs on the side of the printer