I am new to 3D printing, and recently purchased an Ender 3 Pro, along with upgraded springs, and glass bed - I had finally managed to get my settings perfect for TPU, and had run several successful prints. I bought the upgraded motherboard with the silent stepper motor drivers, and install went fine - However, when I tried to print out a test print, it seems like the walls are not filling in like they did before the upgrade (See pic)




My bed is level (I triple-checked), temp for print is 220, bed temp is 60, cooling fan is disabled, and speed is 15.0 (No retraction) - Could someone point me in the right direction to get my prints back to 'normal'?

Is this a test print you have run successfully before with that material and at those temps, etc?

How long between last print on that reel and this one?

Suggest you run "Benchy" and show results.

After such big change in your printer you should re-calibrate everything.
In the case that you're describing I would start with esteps (Extruder Motor stepping) that is most likely cause of underextrusion, but also print a test cube and check accuracy in all dimensions.

Printing TPU is not the easiest material to play with on you 3D printer. Especially after such major upgrade.
But if it's your only material of choice, it seems sensible to calibrate on it too.


Here is a good guide on how to check everything, including esteps:
Teaching Tech 3D Printer Calibration


And here you've got a video describing it:

(13-Jan-2023, 07:34 AM)Bad Raven Wrote: Is this a test print you have run successfully  before with that material  and at those temps, etc?

How long between last print on that reel and this one?

Suggest you run "Benchy" and show results.

I had printed this test piece successfully numerous times before upgrading the motherboard, with the same temps and configuration - It was about 6 hours between the 'good' print, and this last one (TPU is in a dry box, so moisture is not the issue) - I am grabbing 'Benchy' now, and will post pics of it when it's done.

The only calibration I was not able to do was the E Steps, I do not have anything to measure with, and since I only have TPU for filament I was told it would no work because of 'stretch'

The Benchy print just finished, and this is the result:







Where to go from here?

Get the cheapest roll of PLA you can find and use that for calibrating e-steps.

The roll of PLA will come in handy for future projects.

Finally got some PLA to calibrate the esteps, but now I have an issue with the right side of each print not connecting correctly - Other than that my prints are coming out clear - What do I need to check to get the prints connecting correctly?

(13-Jan-2023, 08:48 PM)relentlesstech Wrote: The Benchy print just finished, and this is the result:

Where to go from here?

Delay in reply as been away..........

Considering that's in TPU, its not at all a bad Print. The stringing is atypical for TPU especially with a torture test like Benchy, and a waft with a hot air gun would remove/reduce that.

SO, what does it show? That the basic printing is OK. Now you have to look at the print settings for YOUR other prints. The missing parts may well be due to wall thickness (perimeter) settings.

Neither of the prints you have shown as iffy/faulty are really clear enough in pics and its also not clear what they SHOULD look like, especially the second three items.

If not infringing copyright, put the files here and I'll try to print them?

This is the STL for the switch covers that won't print right (Attached)