When I'd build my Ultimaker, I didn't use all the end plates because i felt that the endplates did resist on the ashes. however, because i do not have the endplates anymore, the ashes walk out of there bering. I Also needed a little more expiriance with OpenScad, so I desided to bring those two things together. as you can see, there is a little dot in the "Closure" part. this dot is meant to redice the resistance with tha as.So No real deep thoughts after all, just a need and a wish combined :-PPS. in the script, you can also change the Closure and the frontplate so that there is a better mount between them.Have fun with your Ultimaker,PS.This design was removed from thingiverse (see: http://www.thingiverse.com/thing:12709)