To be fair, I have not used one of the pens, but I do have a 3D printer. I have avoided the pens as I am not sure how useful it would be. Most seem to use a very specific filament. With the price of 3D printers coming down you may want to go that route. Check out the Monoprice models as they are very affordable for the smaller models. Then you will be able to print out things for the quad. Be forewarned, there are no many files floating on the web for the XSP. I have only found gimbal locks.