scott.m38
Posts: 12
Joined: Nov 05, 2018 6:42 pm
Contact: Send private message

New i3mk3 - worked great for two days, now PLA always lifting

Dec 06, 2018 6:58 pm

...and can no longer complete prints. operating for 7 days now. first 2 days of printing was fantastic. then degraded...progressively.
using spring steel bad. cleaned with 91% IPA, using Prusa grey PLA that came with Kit.
Using Slic3r PE. Extruder temp 215C, bed 60C.

many nice - perfect prints - first couple days.. now everything not working as well and half way through any but the smallest prints, PLA fails to stick.
this morning, small job completed, but one end had started lifting. SAME item that printed perfectly a couple days previously. Operating in stable temperature room @ ~23C.

1/ do I need to clean bed surface with Acetone?

2/ has PLA absorbed (too much?) moisture. House has been stable 35% humidity since opened new spool.

3/ continue to wonder if Z height is correct. The Z calibration will print a full pattern, nice fill in the square patch, but the PLA lines leading to the square patch are very thin. like too high, but I wonder if is too low, with too-flat 'bead' when looking at the 'wipe' before every print, which is very flat. This has been the case the entire time, yet early prints were flawless.

About day 2 or 3 updated the slic3r software. today updated the firmware to 3.5.0. Is there any particular troubleshooting procedure and/or specific tests anyone can recommend?

Thank you - scottmi

Best Answer by toaf » Dec 06, 2018 7:44 pm
wash the bed like a dish with dish soap and hot water, I use a paper towel in the sink. dry it then try it.

I swear it's like magic. unless something else is going on. but if its just not sticking I would try that

GO TO FULL POST ➙

User avatar
toaf
Posts: 680
Joined: Jul 16, 2018 10:24 pm
Answers: 5
Location: st. paul minnesota
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 06, 2018 7:44 pm

wash the bed like a dish with dish soap and hot water, I use a paper towel in the sink. dry it then try it.

I swear it's like magic. unless something else is going on. but if its just not sticking I would try that
I have a Prusa,
therefore I research.

thanks,
chris

scott.m38
Posts: 12
Joined: Nov 05, 2018 6:42 pm
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 07, 2018 5:16 am

Tried that.. thanks. got one print out. next one, 95% done, then off the powder-coated steel.

who is having extended success with the steel?

User avatar
toaf
Posts: 680
Joined: Jul 16, 2018 10:24 pm
Answers: 5
Location: st. paul minnesota
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 07, 2018 6:02 am

my pei has done way better then I ever thought
I have a Prusa,
therefore I research.

thanks,
chris

scott.m38
Posts: 12
Joined: Nov 05, 2018 6:42 pm
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 07, 2018 4:47 pm

Printed the PRUSA badge again last night as a test. It worked... usually i get 30 minute prints ok. Over than, they lift, and crash

When PLA lifts at corners of a print, should i raise bed temp? Lower bed temp? Slow down print speed?
The pieces certainly seem well attached for first layer (printing a flat key fob, similar to the Prusa badge, but a bit thicker).

Using the Slic3r PE standard setting of “optimal .15mm” with 20% grid infill and rectilinear shell seems to go furthest currently before failing.

Previously, any combination of infill and shell choices worked (and looked good!).

Is it the PLA? Is it the bed surface? Why is adhesion failing? (When it did not first couple days of printing)?

larry.c3
Posts: 2
Joined: Aug 20, 2018 4:32 am
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 07, 2018 7:36 pm

When it comes to bed adhesion there are a number of things you can do. First is make sure the build plate is clean of the oils from your hands. Normally you do not have to wash the build plate very often if you can keep the oils from your hands off the build plate. A quality soap like dawn is good for removing oil. A glue stick ships with the printer and is super handy for helping stubborn prints stick to your bed. You can clean glue stick off with denatured alcohol when you start losing adhesion from it. You can use steel wool to help bring back the stick of your PEI surface but I would not be overly aggressive when using it. As a note I do not think you need to use steel wool because you have been printing just over a week. I have printed so much on my printer that from time to time I need to clean the build plate then use steel wool to bring back some of the original adhesion it had. You can use acetone on the build plate to remove anything alcohol can not. Just need to wet a paper towel with it and lay it on your build plate for a few minutes then clean build plate as normal. The acetone is normally not necessary unless you have printed so many prints that you literally have old residual platic from past prints causing bed adhesion issues which I find unlikely in your case. Now you said you are having some curling around the edges of your prints so I would avoid exposing your printer to large temperature changes. Fans or an AC duct can cause your layers to contract from the print cooling to quickly. On a final note calibrating your first layer helps as well.

User avatar
tim.m30
Posts: 259
Joined: Sep 09, 2018 11:03 pm
Answers: 3
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 07, 2018 8:53 pm

When PLA lifts at corners of a print, should i raise bed temp?
A corner lifting is thermal expansion at work. Raise bed temp in 5c increments. Probably shouldn't need to exceed 70c for PLA. An IR thermometer can help establish the right 'actual' bed temp.

The Textured Power Coated sheet is PEI. Same cleanliness rules apply. Touching the sheet with bare hands is a very bad idea if you want PLA to stick. A single fingerprint will migrate with time and coat the entire sheet with oil (experience talking).

Wash & dry hands; then wash bed using a drop or two of detergent and a paper towel; dry with a new paper towel handing only the edges of the sheet. Then rinse with 91% or better alcohol and dry with a fresh paper towel.

ps: Some people who can't seem to wash the bed properly resort to sanding. Sanding doesn't work on a textured bed unless you sand blast to get into the divots. I was at the point of trying sanding (I was really frustrated), but finally found I was touching the bed way too much and it took several washings to get the bed clean, using ONLY fresh paper towels after each step. Dish rags, sponges, dish towels, all leave extra crap. Anti-bacterial detergent isn't a good choice, either. It doesn't rinse well.

scott.m38
Posts: 12
Joined: Nov 05, 2018 6:42 pm
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 08, 2018 1:09 am

larry.c3 wrote:
Dec 07, 2018 7:36 pm
When it comes to bed adhesion there are a number of things you can do...
Larry, thank you. Yes, clean and alcohol wiped plate. Also, this is not the PEI surface, it is the powder-coated spring steel surface. Reset PINDA sensor down a hair and am currently running multiple first level z calibrations to confirm have best setting.

scott.m38
Posts: 12
Joined: Nov 05, 2018 6:42 pm
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 08, 2018 1:15 am

tim.m30 wrote:
Dec 07, 2018 8:53 pm
When PLA lifts at corners of a print, should i raise bed temp?
A corner lifting is thermal expansion at work. Raise bed temp in 5c increments. Probably shouldn't need to exceed 70c for PLA. An IR thermometer can help establish the right 'actual' bed temp.

The Textured Power Coated sheet is PEI. Same cleanliness rules apply. Touching the sheet with bare hands is a very bad idea if you want PLA to stick. A single fingerprint will migrate with time and coat the entire sheet with oil (experience talking).

Wash & dry hands; then wash bed using a drop or two of detergent and a paper towel; dry with a new paper towel handing only the edges of the sheet. Then rinse with 91% or better alcohol and dry with a fresh paper towel.

ps: Some people who can't seem to wash the bed properly resort to sanding. Sanding doesn't work on a textured bed unless you sand blast to get into the divots. I was at the point of trying sanding (I was really frustrated), but finally found I was touching the bed way too much and it took several washings to get the bed clean, using ONLY fresh paper towels after each step. Dish rags, sponges, dish towels, all leave extra crap. Anti-bacterial detergent isn't a good choice, either. It doesn't rinse well.
The powder coated is PEI too..? Well, very good to know. Thank you! Ok, another hot water and Dawn soap wash will be done right after this post, followed by an alcohol wipe and clean hand and paper towel handling—experience does matter! Thank you also for the increasing bed temp suggestion. Helpful and actionable.

danal.e
Posts: 5
Joined: Nov 20, 2018 1:54 pm
Contact: Send private message

Re: New i3mk3 - worked great for two days, now PLA always lifting

Dec 08, 2018 2:14 am

You asked for whom this is working. I also have a 7 day old (as of today) Mk3. I have printed a total of 5 days and a few hours of that time, per my logs (not the printer logs, separate logs that I keep).

Every single print has stuck just fine. With the exception of a print that had an incorrect first layer in the STL, and when that was fixed, it stuck fine. If I see visible fingerprints, I clean with 90% alcohol. Other than that, no particular bed maintenance.

It is printing as I type this, and everything seems to be sticking. I just looked. About twenty minutes, Z is at 1.48 so it is several layers in, complex shapes, sticking just fine.

So... no help for your problem, but a data point that someone with a new-ish printer is having success. Good luck.
IMG_0060.jpeg
IMG_0060.jpeg (615.27 KiB) Viewed 294 times

Return to “General discussion, announcements and releases”

Who is online

Users browsing this forum: No registered users and 1 guest