Finally nailed the settings for my big functional print

I ran into something similar with a big gear set last month, but my issue was more about thermal stability since the chamber gets so hot during those long prints. I was using a standard PLA, but the warping on the corners, even with the AD5X enclosure, was driving me nuts untill I adjusted the bed temp a bit higher than the default. I increased it by about five degrees and saw a massive reduction in lifting. That little change made all the difference in keeping those massive components from delaminating before they even cooled down. I also found that for very large, high-detail pieces, increasing the cooling fan speed by just ten percent helped clean up the minor layer lines on the supports. It sounded like a minor tweak, but it prevented a bunch of post-processing frustration. It seems like with those big build volumes, optimizing one setting often fixes a problem that seems tied to another part of the system. Happy printing with the setup.

I spent a good few days messing with the print speed specifically for my bracket designs before dialing in the flow rate. Since the AD5X moves quite fast, I noticed that keeping the cooling fan at 100% all the time wasn't actually helping the overhang quality as much as I thought. Instead, I found that running the fan at 60% and increasing the layer time a bit made the initial structure much stronger and cleaner. The difference was huge when printing with ABS filaments. I was using a high-temp PLA mix for one job, but for the engineering bracket, ABS was a must for durability.

My biggest headache wasn't the dimensional accuracy of the finished part, but the layer adhesion when the model changed direction quickly. My solution was slightly reducing the print speed in the outer shell setting from the default 250 mm/h down to 200 mm/h. It might sound small, but that little change in speed smoothed out the banding on the vertical surfaces significantly. It took some trial and error to find the correct balance, but it finally gave me that high-volume output without sacrificing the quality of the internal geometry. It felt good to get the machine running exactly how I needed it for the job.

Totally agree with what you said about the thermal stability and the bed temperture adjustment for those big prints. That five degree tweak really makes a huge difference when you're dealing with warping on such large components. When I was dialing in my settings and adjusting the flow rate, I noticed that if I didn't keep the nozzle temperature perfectly consistent, the flow changes felt inconsistent regardless of my slicer input. I had to lock the heat setting down tight before I could see reliable results on the dimensional accuracy.

You guys are always chasing the perfect flow rate and retraction distance, but the real bottleneck is usally the original design. If the CAD model is flawed, no amount of slicer tweaking is going to magically fix a poor tolerance. Back when we were doing this on milling machines, we fixed problems at the drawing board, not by messing with printer settings. I find that the best way to approach a complex part is to check the build orientation first. Once the geometry is sane, then you start looking at the slicers. What software are you using to generate these files anyway?

Quick update — I figured out the issue with the corner warping. Trying that five degree increase in bed temperature like one of you mentioned really stabilized the large parts. The dimensional accuracy is much better now and the pieces fit up perfectly.