I’ve posted it online now as well as included a pic of the LEDs lit up through the PETG pipes.

I’ll post it to Printables.com soon. I’m not sure how common the brittle plastic issue was but, yeah, there seem to be a lot of variations using this exact same case design.

I haven’t seen the LEDs yet since I’ve lost the power supply, but I’ve used the same PETG pipe technique a couple of times before and it works great.

Have you tried a new nozzle?

If your nozzle is worn flat (from scraping), it could affect your nozzle-bed gap (assuming no adjustment). If the internal diameter is worn (from long-term usage or an abrasive filament), it could cause a type of under-extrusion.