They look great! Are you planning on coating them with something absorbing on the inside faces? for the 3D printable mini spectrometer I coated the inside face with some flat matte black spraypaint and the SNR went up over an order of magnitude from the stray light. :)

Hi Peter, Thank you! And sorry for the delayed reply! I didn't realize there were replies on the posts themselves and the site doesn't notify there was a reply!

Yes, I had planned on coating the inside.. I ran a couple tests yesterday and today with the mirror, objective lens and the laser... My hopes was that the black plastic would possibly reduce a little, but it's too shiny in some places... I think a nice coating on the inside.. maybe even some light traps along the beam path, etc.. The 150mw laser is so bright it turns out, and the parts I printed so far are in 'medium' quality, that you can actually see the beam through the parts in some places... I need to increase the density of the prints (currently set to 20%-very low) and the quality, then run some more tests.. Another thing I noticed is the seam along the joints tends to leak a little light...so I need to add some beads or something around the seam which should help with the parts fitting better too.. My whole objective with this new design was to eliminate stray light and environmental light, etc.. I'd hate to create a whole new problem! But I think you're right.. Coating the inside would be very beneficial..