After a good cleaning, and re-calibration of the printer...and about 16 hours of printing... I have success.. Here is the spectrometer top and bottom!

With the entrance slit facing us...

Top on the left and bottom on the right... 

I'm very happy with the way this came out... Now it's time to put the whole thing together!!!

I'll post some in progress shots of assembling it, with the optics, etc...    soon!  I didn't include the light baffles, etc... because I want to work out the best configuration...  This is still a rough version, albeit much nicer than the last...but the screwholes need to be widened up a bit too...mostly for the four mount points and the collimating mirror mount..  Updates soon to follow!