First layer calibration/calibration prints sticking/oozing issue  

Re: First layer calibration/calibration prints sticking/oozing issue

The oozing is normal. But I don't really see the link between this and over-extrusion ❓
Is you want to minimize the oozing, do the mesh bed leveling at a lower nozzle temperature, 170°C for example, and then set it to the target temp after.

Re: First layer calibration/calibration prints sticking/oozing issue

the only two 'good' automated solutions to the oozing i've seen would be something like the dump buckets on an ultimaker or the fuzzy wiper on the taz.

you just have to get good at snagging it with pliers before it starts. I add a user pause and buzzer to my start script to remind me to clean the nozzle and make sure the oozing is finished before printing.

Re: First layer calibration/calibration prints sticking/oozing issue

The oozing is normal. But I don't really see the link between this and over-extrusion ❓
Is you want to minimize the oozing, do the mesh bed leveling at a lower nozzle temperature, 170°C for example, and then set it to the target temp after.

New to printing so thats good to know. The link is it doesn't stop oozing, it continously oozes until i either retracted the filament slightly or lower the temp sub 200C. So when i print and it needs to not put a layer down, it's ozzing and that ooz sticks to the printed layer causing it to catch and pull the print off the bed. I cant even print a skirt it's so bad. When the plastic comes out it always wants to curl up towards the nozzle and ends up sticking to the nozzle as well.

Re: First layer calibration/calibration prints sticking/oozing issue

the only two 'good' automated solutions to the oozing i've seen would be something like the dump buckets on an ultimaker or the fuzzy wiper on the taz.

you just have to get good at snagging it with pliers before it starts. I add a user pause and buzzer to my start script to remind me to clean the nozzle and make sure the oozing is finished before printing.

I gotta learn the scripts first. and my issue is it doesn't stop oozing. But thanks! i'm going to look into it more.

Re: First layer calibration/calibration prints sticking/oozing issue

The oozing is normal. But I don't really see the link between this and over-extrusion ❓
Is you want to minimize the oozing, do the mesh bed leveling at a lower nozzle temperature, 170°C for example, and then set it to the target temp after.

New to printing so thats good to know. The link is it doesn't stop oozing, it continously oozes until i either retracted the filament slightly or lower the temp sub 200C. So when i print and it needs to not put a layer down, it's ozzing and that ooz sticks to the printed layer causing it to catch and pull the print off the bed. I cant even print a skirt it's so bad. When the plastic comes out it always wants to curl up towards the nozzle and ends up sticking to the nozzle as well.

The extrusion curling up to the nozzle sounds very much like a partially clogged nozzle.
That can lead to the oozing (pressure building up and slowly relasing) and underextrusion issues.
(I had issues with first layer and plastic sticking to the nozzle yesterday and found out I hadn't tensioned the Bondtech gear enough --> underextrusion --> bad first layer, co,ing off, plastic on nozzle)

I'd do a cold pull (or several), check the Bondtech tension, use proven filament (Prusa silver works really reliably IMHO) and report back.

Re: First layer calibration/calibration prints sticking/oozing issue

The oozing is normal. But I don't really see the link between this and over-extrusion ❓
Is you want to minimize the oozing, do the mesh bed leveling at a lower nozzle temperature, 170°C for example, and then set it to the target temp after.

New to printing so thats good to know. The link is it doesn't stop oozing, it continously oozes until i either retracted the filament slightly or lower the temp sub 200C. So when i print and it needs to not put a layer down, it's ozzing and that ooz sticks to the printed layer causing it to catch and pull the print off the bed. I cant even print a skirt it's so bad. When the plastic comes out it always wants to curl up towards the nozzle and ends up sticking to the nozzle as well.

The extrusion curling up to the nozzle sounds very much like a partially clogged nozzle.
That can lead to the oozing (pressure building up and slowly relasing) and underextrusion issues.
(I had issues with first layer and plastic sticking to the nozzle yesterday and found out I hadn't tensioned the Bondtech gear enough --> underextrusion --> bad first layer, co,ing off, plastic on nozzle)

I'd do a cold pull (or several), check the Bondtech tension, use proven filament (Prusa silver works really reliably IMHO) and report back.

I was thinking it was clogged, but the needle method didn't do anything. Today, i did a few cold pulls and tightened the bondtech. This is the first time the calibration print worked, but it came out like this (baby step progress lol)
https://imgur.com/s91TjmJ

Re: First layer calibration/calibration prints sticking/oozing issue

Your nozzle is way too high.
Live adjust Z needs a larger negative number.

Re: First layer calibration/calibration prints sticking/oozing issue

Your nozzle is way too high.
Live adjust Z needs a larger negative number.

Ok so that's what i thought. My issue now is, my PINDA is at the height of the tip of a ziptie, but and the best test print came out (still stranded, but much better looking) my Z adjustment was at -950, it says not to go over -1. So im scared to go up to -1, but it seems like that is the height it needs to be at.

Re: First layer calibration/calibration prints sticking/oozing issue

its not that big of a deal going over 1. wouldn't hurt to move the pinda abit BUTTT I think the only thing it could mess with is some temp issues if you have it turned on. think its off by default

Re: First layer calibration/calibration prints sticking/oozing issue

its not that big of a deal going over 1. wouldn't hurt to move the pinda abit BUTTT I think the only thing it could mess with is some temp issues if you have it turned on. think its off by default

ok, so i ended up moving it to -1.2..... and got a much better print, just some issues on the edges. Is that bc it's not sticking to the bed, or something else. I probably will move the pinda, but im so close to a good print I want to get a good calibration print out then i'll adjust accordingly.
https://imgur.com/a/StsL01R

Re: First layer calibration/calibration prints sticking/oozing issue

-1.396 perfect print. Beyond happy, it's been a month since ive been able to print. Running a simple 1hr print to make sure it's working correctly. Thanks for the advice/help! Much appreciated

Re: First layer calibration/calibration prints sticking/oozing issue

nice, just remember if you turn on the "heat sensing" you might want it lower then 1. but that stuff is semi micro managing of z height

from what I think I understand about it.

don't forget "lower is higher" with pinda in a fasion...

Re: First layer calibration/calibration prints sticking/oozing issue

its not that big of a deal going over 1. wouldn't hurt to move the pinda abit BUTTT I think the only thing it could mess with is some temp issues if you have it turned on. think its off by default

Agree - the nozzle is much too high, that needs to go down a lot.
Since this is a MK3 Prusa, the PINDA has temperature compensation, so that would not be an issue.

With Z level of -1000 I would go back and repeat the PINDA height adjustment. I'd suspect that the probe is too high.
On my MK3 I have exactly -500 for PLA.

I really learned the last few days (again) that an FDM printer is a pretty sensitive and complex device, and it's important to try to eliminate each potential issue in order to have successful and reliable results. When everything works fine it looks so easy, but when you run into an issue, all you can do is check item by item and correct any issues you find.

Re: First layer calibration/calibration prints sticking/oozing issue

Your nozzle is way too high.
Live adjust Z needs a larger negative number.

Ok so that's what i thought. My issue now is, my PINDA is at the height of the tip of a ziptie, but and the best test print came out (still stranded, but much better looking) my Z adjustment was at -950, it says not to go over -1. So im scared to go up to -1, but it seems like that is the height it needs to be at.

There's no need for worry.
A larger (negative) number just means that your PINDA probe is a touch closer to the nozzle level than ideal.

Let's say the PINDA signals at 2mm, and your nozzle and PINDA were dead nuts level. Your Live Z would be ~1.8 to set your extrusion at.0.2mm.
In general, you want about 1mm difference in the levels.

If you are really concerned about a too large negative Z, turn the probe a quarter turn up. Buy yourself 0.25mm 🙂

If anyone thinks I'm not understanding the mechanics of the extruder, please speak up. If I'm wrong, I'd like to know.

Re: First layer calibration/calibration prints sticking/oozing issue

The only potential issue with a too large negative value is that the probe may be too low and could hit the object during the print.

BTW, Prusa has updated the value in the current handbook, they say now to not exceed -2.0mm (see page 24)