Duplo 2x4 block, 6 blocks high

When building bridges with Duplo tracks and the bridge you need lots of blocks. For every story you need 6 blocks, if you daisy chain more bridges (in order to reach a table or something like that) you need many many 2x4 blocks. I am a bit lazy and designed a 6-blocks high 2x4 block. Printing 1 block takes around 8 hours on the M200, printing 8 in a row (weekend job) is taking about 550g filament.
Be kind, this is one of my first designs ;)