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Can i do better on my first print?  

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eikido
(@eikido)
Active Member
Can i do better on my first print?

I've written the negative z value on the back of the logos. NC stands for new calibration.

 

 

Can i do better than this without the stringing and the blobs (see the top right of the S) ?

 

 

 

Publié : 06/07/2019 5:56 pm
eikido
(@eikido)
Active Member
Topic starter answered:
RE: Can i do better on my first print?

readded higher resolution pictures.

 

Publié : 06/07/2019 5:57 pm
bobstro
(@bobstro)
Illustrious Member
RE: Can i do better on my first print?

Just a few minor things to work on:

  • Your Live-Z is just a tad high. Not bad, but those lines on the bottom should really close up. If you have not already done so, try using [Jeff Jordan's "Life Adjust" procedure for calibrating your Live-Z setting. It is much easier to use and understand than the on-board routine. When you've got your Live-Z setting adjusted properly, you should be able to gently rub the extruded lines without dislodging them from the PEI surface. More notes on Live-Z calibration here. I recommend starting high (less negative) and working your way down (more negative). Initially, lines may not adhere at all. Keep going lower in large increments (0.20mm) until lines start to stick. Go lower in smaller increments (0.10mm) until you get good, even 1st layer lines with no gaps between extrusions. When you peel that print up, you shouldn't be able to tear the print apart along the extrusion lines easily. This is one of the most important things to master for long-term success.
  • The little squishy bits at the top-left of the U and top-right of the S are caused by wiping. It's generally a good thing, so I wouldn't turn it off, especially with the stringing, but you could turn it off to confirm.
  • The wiping marks and stringing may be aggravated by a bit of over-extrusion. Prusa has a nice summary on how to tweak your extrusion multiplier. You'll want to do this for each filament and save it in a filament profile.
  • Dropping temps slightly (5C) can help with stringing. There is a lot of variation between printers.
  • You can try playing with retraction (keep it below 2mm) and z-lift (turn it off to test, it contributes to stringing but helps with top surfaces).

In a perfect world, your extruder would put out just enough filament to do what the commands tell it to and you wouldn't need a lot of these workarounds. Don't go over-board. Start with Live-Z, then the calibrating the extrusion multiplier. See how things look then and tweak as needed.

Also keep in mind, the results you get with a small test part don't necessarily reflect what you'll get with actual prints. I spent way too long staring at worst-case stringing tests and 20mm cubes.

Overall, it looks pretty good. Be sure to have fun with it!

My notes and disclaimers on 3D printing

and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

Publié : 06/07/2019 6:11 pm
eikido
(@eikido)
Active Member
Topic starter answered:
RE: Can i do better on my first print?

Thank you very  much bobstro!!!

Your tips were extremely helpful and i think i'm closing in nicely.

So the wiping is completely fine? Ok 🙂

I lowered the hotend temp from 215 to 206 and it helped a lot against stringing.

What are the downsides of going to low on the hotend as i did?

Any other things i can do to decrease stringing?

I feel ready to start printing my other stuff now 🙂

 

Publié : 08/07/2019 7:03 am
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