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Print problems

As the 'Improving' thread is getting a little long and other people seem to be making better progress...

What is causing these errors?

The top and bottom perimeters measure very close to the 30mm I've set. The infill is set to 10% but appears to be over extruding which would explain the step in the print and I can hear the nozzle dragging when it's printing.

The corner overhand and burn though??

22 comments

22 Comments

Hermann Dengler

Jun 24, 2022

When the 3DBenchy is printed, the layers do not adhere firmly to one another. From a height of the printed part of about 50%, the printed parts break off and the printer prints in the air.
I use the CURA default settings. Even increasing the hotend temperature to 220°C does not bring any significant improvement. I use PLA. The filament prints great on the old printer. Maybe the speed of the fan needs to be changed or is there another suggestion?

Gareth Owen

Aug 31, 2020

Z Gantry guides

https://www.thingiverse.com/thing:4580455

Michael G

Aug 31, 2020

@Gareth Owen Here's a link to it on my OneDrive: https://1drv.ms/u/s!Ap-VAFK0G7KKq3TVMs6IeM68rwMi?e=ubeSmo

On the GitHub site (https://github.com/Makertech3D/AXIS/issues/2) I've submitted an issue to ask for the STEP files for the cooling setup that is shown on the printer in the Kickstarter videos. I have a pile of 5015 24v blower fans sitting around and wouldn't mind trying a better cooling setup.

I'm going to have a write up soon on my linear rail mods. I really think spending the $55 on the set wouldn't hurt. Your design skills will probably let you get way further than where I am.

Gareth Owen

Aug 31, 2020

Replying to

Thank you for that!

First thing I noticed was that I only have a single extruder and no heated bed - my printer was waiting for quite some time before I realised!!

Your print speeds are set much slower than I had but I'm giving it a run to see what happens...

Would you like me to design a proper cooling duct rather than multiple fans adding weight to the gantry?

Michael G

Aug 31, 2020

Replying to

@Gareth Owen I'd say go with what you think best. I had wondered if it we should just redesign the whole tool carriage. It would be easier to make the part cooling setup how we'd like it. The motivation around this thought came while I was looking at some of the cooling setups for the Ender 3 and wondering if we could adapt them to work on the AXIS. It would also be nice to make the hotend cooling fan part of it as well. That way we could move to a different hotend (microswiss) with just a small tweak. Finally, on a bit more selfish note, it would help me when trying to fit the slider of the y-axis linear rail. All that might be a bit too much work, though. That said, I trust whatever idea you cook up will be something awesome!

Gareth Owen

Aug 31, 2020

Replying to

@Michael G it's definitely the coupling that I'm replacing next (again!) - this time for a solid one. The print failed in the exact same way as before.

I'm still designing a sprung version of my XZ guide in my head - I'd like to use steel springs as the reaction time is much quicker than using some type of foam.

I'll upload my Z guides which are much easier to get an accurate adjustment.

Michael G

Aug 31, 2020

So. Here's an update on making my prints better.

Looking much better!

Hmmm. Overextrusion? I sliced in Prusa Slicer. The movement speeds were just ridiculous. I didn't think I've ever thought that I would see the point where minimum layer time on a Benchy would come into play. The back corners where you can see the bad layer issues were where the nozzle took a moment to start the next layer causing it to melt, but it did the whole perimeter so fast that it never cooled before the nozzle got back.

Overall the rails seem to be doing some good. I'm now working on making adapters for the y-axis so I can mount that rail.