Very Cool Design. Removed the top section and added ventilation and a cap to the middle section of the outer tube. Also made couplings for the tubes. Made extra bracing for the inner tube. Needed to do modifications as the temperature inside the tube reached over 50 degrees with no ventilation and the 5050 LEDs I used which caused the central tube to soften and sag. I reprinted the central section with PETG and drilled holes to allow heat to pass thru from bottom to top. There is no warping now and temperatures are in check. The couplings are noticeable, glue would be a better if you have a steady hand.
How do you stick the sections together? I,ve printed the outside section in three parts but have no idea how to build them stable.
And how do you print the small inside sticks without wiggling while printing?