So, I bought myself a rpi4 and installed Klipper. Very cool firmware quite enjoying it. Still tuning but i’ve got my speed up 3x from my Marlin based firmware. I think I’ll continue looking at the options here recommended and build one – mostly because I want to – not because I am solving a problem. Thanks for putting me onto Klipper.

Thank you everybody for leading me on the right path.

As I had already installed Klipper, I decided to try the pressure advance calibration as suggested and it did take some tuning, but has improved quality immensely.

In the end, here are the settings I changed: Klipper printer.cfg pressure_advance: 0.120

PrusaSlicer:PrinterSettings:Extruder 1:Retraction Length: 0

I still think I can tweak my z-offset and temperature and maybe further refine pressure_advance, but the results are quite a bit better than before.

I used the Klipper guide for pressure advance: https://www.klipper3d.org/Pressure_Advance.html

Original print on the left, print with the above changes on the right.

Having said that, I think I might have been able to improve the results using a marlin firmware and working with my retraction setup – I use a non-default direct-drive extruder so the default settings of about 6mm are certainly incorrect.

Also, into the future, i’ll check out the wear/maintenance on the nozzle – it is a good point and I havent changed it in quite a few prints.

Thank you everybody!

I’ve never really thought much about something specific for petg.

I use a magnetic pei bed, both textured and non textured with a glue stick layer.

I don’t often need to clean but I’ll use soap and water in the sink for the majority and then a isopropyl squirt and rub with a rag. Then I reapply glue stick.

This lasts a lot of prints for me for pla, petg and abs.

Really, I’d think you would need to avoid chemicals that would react with your bed and make sure there is no residue left by your cleaner. For my pei bed I bet I could even use acetone. Beyond that… Happy washing.

There are lots of internet gudes on this. Here is one random one I just found. https://www.wevolver.com/article/how-to-clean-3d-printer-beds-glass-pei-adhesive

No, overlap settings are default. Taller objects or objects with infill come out okay - workable but still show small signs of the issue. I’ve found the 5+ layer object with no infill showes the issue the most so I’ve been using that to tune.

You are absolutely correct that first layer tends not now show issues like zOffset to close to bed or over extrusion. The prints I’ve been using are 5+ solid layers to have any offset alignment or extrusion alignment issues increase with each added layer.

Yes. For this petg I’ve tried nozzle temps ranging from 210-240.

So… I still have some tuning.

I learned that you need to adjust retraction and z offset again after implementing pressure advance… But I’m close now.

Oh boy… Yes scripting comes easy to me. It’s why my default is openscad for making 3d models. :). I’m printing the pressure advance cube model now.

I agree, not just the perimeter but also when it’s going back and forth to fill in the centre area. I’m not sure how to address it – maybe the pressure advance settings LazaroFilm suggested. I’ve also tried printing at a series of different temperatures…

I’ll check that out. I installed klipper yesterday for S&G – actually quite liking the flexibility it gives me. I see the guide.

in those two cases, they are PETG and bed temp was 80. The curved edges were caused by me removing the print from the hot bed… not lifting off during the print.

Yeah. If you are good for pla, it’s not likely the cause.

Thanks! I hadn’t considered the slicers. I don’t have a driving need multi-matrtial – mostly considering that if I’m going to invest in building a printer, I’d want it to be capable in all ways.

Thanks. My main speed issue, I think, is the size of the bed. My base unit was an ender 3 max with a 300x300 bed. On a fast print that bed swings with enough energy to actual move the printer.

I say likely is that I haven’t attempted to solve the issue yet – I don’t need the speed, I simply enjoy tinkering and this is one are I havent.

Having said that, from the original post, while I want to build one from scratch, I’ll probably continue tinkering on my custom printer as well.

I’ve played with up to a 1.0mm nozzle – haven’t had results yet.

I had similar messy results at one point – it tuned out to be a bad zOffset. Having said that, my part also as a messy top layer – not sure if yours has that or not with the little nub there.

Im also all Linux and like many of the other commenters, I mainly use openscad as my primary and freecad. There is a lot of free training video and walkthroughs for both.

Awesome. Thank you for the reply. Sounds like it is time to start printing and collecting parts.