Whiteboard Marker Refresher
thingiverse
Watch the instructables for instructions! I hope it works and helps https://www.instructables.com/Print-a-Whiteboard-Marker-Refresher/
Download Model from thingiverse
With this file you will be able to print Whiteboard Marker Refresher with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Whiteboard Marker Refresher.