Finally retired the last of the original parts on my old Ender

I had a similar expirience with an older model I used for small runs. After a couple of years, I noticed the linear rails started sounding gritty, which was defintely louder than the usual clicking noises. I thought it was just dust, but when I opened the carriage, the ball bearings were just worn down, almost frozen in the housing. The first few test prints were actually worse than my baseline because of that binding movement. It wasn't just the rails though; the lead screw itself felt a bit loose, which caused the Z-height to drift over the course of a long print. I ended up swapping out the original carriage assembly for a complete kit I ordered online. The quality of the replacement parts was surprisingly good, which helped immensely with the noise issue. The entire thing runs much smoother now that the movement is consistent.

It really changes the quality of the prints when that mechanical foundation is sound. You might think a clean part swap is just a cosmetic thing, but the thermal mass and precision of the movement make all the difference in achieving those tight corner details.

My experience with my older machine was less about sudden breakage and more about slow, annoying inconsistency, especially after about a year of use. I started noticing slight drift in the extrusion when running prints that exceeded twelve hours. It wasn't bad enough to fail the print completely, but the dimensional accuracy just started to sag over the later layers. I figured it was just heat soak, but I decided to experiment with the hotend block setup.

I replaced the original brass heat sink with a copper version and added a small heat shield around the nozzle area, specifically to manage the thermal creep near the board. It cost about forty bucks, which was steep, but it changed how the print behaved. The biggest change was in the consistent flow rate. Before, the plastic would sometimes start to seize up slightly during the long rest periods between passes, but the new block held its temperture much more stable.

I also found that slightly adjusting the ambient temperature of the room made a noticeable difference in the stability of the temperature, even with the upgrades. It seems like sometimes the mechanical components are fine, but the environment and the thermal dynamics are what really dictate the final quality of the output.

That drawer bit hit home. I've got a warped magnetic bed sheet sitting in mine from when I upgraded, three years ago now, and I still can't bin it. Ran somewhere around 800 hours of prints on that thing before the coating gave up. On the noise front, don't overlook the belt tension either, a slightly loose X belt on mine made a low drone I blamed on the fans for months. Nipped it up til it twangs like a bass string and the whole machine calmed right down. Curious what you're doing for the fan housing, printed or off the shelf?