Enjoyed peeling this away from my nozzle...  

  RSS
rotto
(@rotto)
New Member

Any ideas how to prevent this?   This was after five successful prints of the identical piece.   

   - Ralph / San Diego, CA

Posted : 18/11/2020 11:59 pm
jsw
 jsw
(@jsw)
Noble Member

Best advice, from experience, is keep an eye on the printer.

It looks like your print broke away from the build plate.  Be sure that your plate is truly clean.  It's tempting to simply launch another print immediately after finishing one, but care needs to be taken to be sure the new print will stick.  A simple fingerprint can cause just this.

Posted : 19/11/2020 12:56 am
rotto liked
bobstro
(@bobstro)
Illustrious Member

You got lucky. That's minor as far as Blob-of-Doom mishaps go. It's not uncommon to have extruder part damage and hours of cleanup. In addition to the advice to keep the bed clean -- which explains why it "went bad" -- be sure to get a good Live-Z calibration. 

I believe they are starting to sell silicone socks to help protect the heater block against filament build up. I find them lifesavers on my printers.

 

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...
Posted : 19/11/2020 2:37 am
rotto liked
rotto
(@rotto)
New Member

@jsw @bobstro

Thank you - I have been wiping down the smooth sheet with IPA between prints but maybe I missed a spot, or perhaps it was just a glitch in the extrusion.  I am officially 4 days into my 3D printing (completed my Mk3 kit Saturday morning by 4:30 am).  I do agree I need to watch for failures and now have a camera trained on the printer so I can check on it periodically.

Bob, I just ordered a set of the socks and am looking forward to seeing how much of a difference they make.  Hopefully they will help keep small blobs from turning into massive ones.

I appreciate the feedback and looking forward to contributing to the forum!

-R

 

Posted : 19/11/2020 2:55 am
bobstro
(@bobstro)
Illustrious Member

There are lots of threads on bed adhesion. Be sure to read up on them. The single best thing you can do to prep the bed is a dunk under the sink with plain Dawn dish soap. Scrub it with a clean plain paper towel and dry it with another. Do nothing else to prep the bed, then calibrate your Live-Z using Jeff Jordan's "Life Adjust" procedure. Repeat as necessary whenever adhesion starts to weaken, or before lengthy prints.

Good luck and 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...
Posted : 19/11/2020 4:55 am
--
 --
(@-2)
Illustrious Member

Yeah - alcohol is quite good at spreading fingerprints around the sheet unless you are an expert at using an ounce of alcohol and a fresh microfiber cloth each clean. A dash on a paper towel and a few wipes do nothing to clean the sheet. Soap and hot water works best, and I use soap and water after I use alcohol or acetone when I need to remove plastic residue.

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 19/11/2020 8:15 am
Peter M
(@peter-m)
Prominent Member

A new pei sheet does not stick as a older one.

Clean the sheet with dish soap, clean a few times with hot water(new plate), then clean with dish soap every few prints.

If you have to print prints that need very good sticking to the bed, clean with dish soap.(big flat prints or model with small footprint to the bed.)

Every finger on the bed, will reduce the sticking, so do not touch the bed. Oil from your hand will destroy sticking.

If you use alcohol, use a lot.

To prevent the big ball of death,

1. first layer needs to be 100%(learn this very good is important).

2. A clean bed.

This post was modified 5 months ago 2 times by Peter M
Posted : 20/11/2020 8:06 am
rotto liked
cwbullet
(@cwbullet)
Illustrious Member
Posted by: @ralph-1

Any ideas how to prevent this?   This was after five successful prints of the identical piece.   

   - Ralph / San Diego, CA

Ralph: Can I use this photo in a blog post?  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 20/11/2020 12:12 pm
rotto
(@rotto)
New Member

@cwbullet

Absolutely - thank you for asking 🙂

Posted : 20/11/2020 7:10 pm
cwbullet
(@cwbullet)
Illustrious Member

I like saving photos for articles on printing disasters.  I try to ask before using them.  I will give you a footnote.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 20/11/2020 7:58 pm
rotto liked
Share:

Please Login or Register