The ONE GAME-CHANGING Slicer SETTING... (Huge 3D Print Quality BOOST)

TO CLARIFY: What makes this huge boost to the print quality is printing the OUTER WALL before the adjacent INNER WALL is printed. That is why I called the Inner/Outer/Inner wall ordering option "printing outer wall first" as it does exactly that. Hopefully, that clarifies things. I know it can be quite confusing. So TLDR: Inner/Outer = IW first Outer/Inner = OW first Inner/Outer/Inner = OW first

This is the first video whose title contains the tired, old "GAME-CHANGER" claim that actually turned out to be a game-changer for me. Printing the outside walls first made a MASSIVE difference in the quality of my prints. I've been living with semi-OK prints for literally 3 years...can't believe I've gone this long without knowing about this setting. Why isn't it on by default in all slicers? Edit to add, after another print: I seriously can't believe the difference this made. My print looks almost injection-molded, for cryin' out loud! And I'm running it on my trusty old Ender-3 V2. Unbelievable!! Thanks for this tip!

I discovered this a few years ago. I realized that the quality is massively improved and there is pretty much no downside. I am really surprised this isn't standard.

One likely reason is that curling and warping are caused by outer layers not having sufficient time to cool combined with the contraction of inner layers as they cool pull in on the outer filament. So by printing an outer wall first, you’re giving the outer layer the most time to cool so that it can be already solidified by the time the printer gets around to it. I legitimately never thought of it like that.

It's wall printing order.

Finally, I've been printing OW first for 5 years now, saves a lot of time on postprocessing too

I started using IW/OW/IW because of the scarf joint feature and it was surprising to me how much better everything became, but I couldn't put two and two together on how that could be so until your video, thanks!

Well done for showing this in your prints, I kept switching between Orca and Bambu and got better results, but never realised what settings I changed as I discarded them. You've jogged the memory cells thank you :)

I've been trying to tell folks outer perimeters first is better for years but everybody looks at me like I'm crazy...

I had great results with these settings as well, though admittedly with limited testing. Most of the improvements make sense. I realized one reason the overhangs being as good or even improving may make sense while watching for video. First of all, the filament has more room to expand and sit on top of the previous layer, since it won't hit the inner wall and then have to squish outward over the side, which could cause a drooping overhang. Sure, you may think because clinging to the inner wall would keep the filament from falling outward that it would help, but the volume of filament extruded all has to go somewhere, so outward is the remaining direction if the inner wall is present. The other reason I think it may help is that not having an inner wall means the outer wall extrusion can be cooled from both sides, it even has a little channel of air flowing past it, and it isn't being kept warm by the previously printed inner wall. I would suspect the added cooling is a much larger factor than residual heat from an inner wall, but the amount the latter varies would depend on the print. I wonder how much outer wall appearance would vary with line width as well, especially with overhangs. Also counterintuitive, but wider layer widths can actually give better overhangs because it insets the outer wall more on the previous layer, meaning the center of the nozzle is less in free air when extruding. Anyways, very interesting tests and results! I do think I saw a slight improvement in your tests with the precise wall setting on, as especially the lower ridge on your far right test print was smoother. Hard to say not holding it though. A combo of outer wall first, precise wall, good cooling, and perhaps even wider than nozzle width layers could be the ultimate combo. Beyond that, precise extrusion is so important, as you repeatedly mentioned. This seems to be the Achilles heel of the K1 series, for example. Once you get extrusion dialed in, testing all of the other settings reveals a lot.

I just recently got into 3D printing and switched to this method after watching your video. Made all the difference in the world. My prints look so much better. Thanks!!!

this may be the final piece to my layer consistency journey, I avoided this bc of the stigma against it for "bad overhangs", thank you!

A while ago, I've also started printing infill before walls (infill-outer-inner), so that any points from bad pressure advance get kinda ironed flat by the head moving by. Might be cool to try as well. Awesome stuff as always!

I started using Cura two years ago for the ultimaker 2+ connect I borrow from time to time and it had outer perimeters first by default. I was amazed by the quality and dimensional accuracy

2:26 Thank you so much for this small piece of information, I already knew printing outer walls first improves quality, but this problem you are discussing here is also super important, while almost nobody seems to know about it.

You earned a new subscriber with this one. Super fascinating idea, to-the-point video, and a good comparison of results. Well done, keep it up! Excited to check out the other videos on your channel and see what else you have in store in the future. Going to give I/O/I walls a shot on my printer right now!

Thankyou for this, I really mean it. I have been having issues with My K1 Max for months, tried everything. I used your suggested wall settings and the 2 mm thing and pow! My print layer lines have finally gone

Just a note on the "prrecise wall", and why it didn't change much: it's intended purpose is to improve dimensional accuracy, which is the aspect I usually care most about. It's nice if it looks pretty, but I most of all want it to work and fit correctly. For that precise wall does exactly what it's supposed to, at least for me. Much less deviation.

I am currently printing some printer feet in TPU. The first two were printed with my old settings, second two are printing with In/Out/In, and I can already see a clear difference in quality.

Great video! I have also been using this setting for a little while now and it’s great. Thanks for the video.