housing for 9V block an little pcb

I designed this housing for testing. It contains a little constant current pcb to test LEDs. It was a charm to design an after 3h printing i got it in my hands..

i love 3d printing :D

I made a little hole in the housing so there can be the pcb mounted.
I use a easy constant current schematic like: http://laserpointerforums.com/attachments/f67/41896d1369541996-constant-current-diode-driver-easy-driver.jpg