Super pinda sensor problem - bad adhesion on first layer after sensor cool down
 
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Damiano
(@damiano)
Active Member
Super pinda sensor problem - bad adhesion on first layer after sensor cool down

Hi to everyone,
I'm happy user 😰  from yesterday of Prusa Mini + but I have problem with Super Pinda sensor 😡  I read about that sensor need 35 degree Celsius for proper working. When sensor is above 35 C it's working great but when it cool down first layer are bad (nozzle is too high for it). I saw that on the morning when is a little cold than during all day.
I found that part of start code as below for fix that:

G28 W ; home all without mesh bed level
M104 S[first_layer_temperature] ; set extruder temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S[first_layer_temperature] ; wait for extruder temp
G0 X50 Y50 Z0.15 ; this is a good PINDA heating position
M860 S35 ; wait until PINDA is >= 35C
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling

I have question. Can I use a little modified code in Mini + ?? Like this below 😰 

G28 W ; home all without mesh bed level
M104 S170 ; set extruder temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp

G0 X50 Y50 Z0.5 ; this is a good PINDA heating position
M860 S35 ; wait until PINDA is >= 35C

G28 ; home all without mesh bed level
G29 ; mesh bed leveling

M104 S[first_layer_temperature] ; set extruder temp
G92 E0.0
G1 Y-2.0 X179 F2400
G1 Z3 F720
M109 S[first_layer_temperature] ; wait for extruder temp

It is correct for my problem ? It will solve it ? Why in example someone use G80 instead G29 ? And G28 W instead G28 ? Can You explain that to me ??
I will be gratefull.

Posted : 07/11/2021 3:08 pm
BogdanH
(@bogdanh)
Honorable Member
RE: Super pinda sensor problem - bad adhesion on first layer after sensor cool down

You are wrong on this (I assume you've read some older articles). Prusa Mini+ uses SuperPINDA, which is temperature independent. Means, if you have any issues, then that's not because of SuperPINDA accuracy would be influenced by temperature. If it works (not broken), then the only thing that matters, is the right distance to bed.

[Mini+] [MK3S+BEAR]...
Posted : 07/11/2021 3:50 pm
Damiano liked
Diem
 Diem
(@diem)
Noble Member
.

I would be very surprised if that was the case.  Please show us your first layer calibration and the underside of a failed print.

Cheerio,

Posted : 07/11/2021 4:04 pm
Damiano
(@damiano)
Active Member
Topic starter answered:
RE:

@bogdanh , @diem
What do You think about that strange behaviour of Super Pinda in my Mini + ??
You suggest that Super Pinda sensor not working right ??
I have live Z adjust on level -1.780 mm and it works great but when I turn on my Mini + today morning I saw that first layer is bad.... (as nozzle to high).
I try few times to set it again but I can't...
When I restart my Mini + it's again OK. I start my print and after bed cool down and start another print and again first layer was bad... (as nozzle to high).

I must try to set first layer after turn on mi printer and I check it is OK.

Posted : 07/11/2021 4:12 pm
Damiano
(@damiano)
Active Member
Topic starter answered:
RE: Super pinda sensor problem - bad adhesion on first layer after sensor cool down

@diem
I don't have any photos but for sure I will make it next time 😊 

Posted : 07/11/2021 4:23 pm
BogdanH
(@bogdanh)
Honorable Member
RE: Super pinda sensor problem - bad adhesion on first layer after sensor cool down
Posted by: @adrian-kowal

@bogdanh , @diem
What do You think about that strange behaviour of Super Pinda in my Mini + ??
You suggest that Super Pinda sensor not working right ??
I have live Z adjust on level -1.780 mm and it works great but when I turn on my Mini + today morning I saw that first layer is bad.... (as nozzle to high).
I try few times to set it again but I can't..

First you need to make sure, that SuperPINDA has the right distance from the print sheet. Here's how to do that:

Move printhead down (by manually rotating Z-shaft) until tip of the nozzle touches print sheet. Now measure distance between print sheet and bottom of SuperPINDA. The distance should be about 1.4-1.5mm. If your distance is less or more than that, then adjust SuperPINDA height. When you finsih, fix (tighten) SuperPINDA so it can't move by itself.
Now start fresh First Layer Calibration by choosing 0 (zero) Z-offset option! If you are using smooth PEI sheet, then you can expect good first layer at Z-offset somewhere between -0.600 and -8.000.

If you still have problem, then show us a photo where we can see your print head and how your first layer looks.

[Mini+] [MK3S+BEAR]...
Posted : 07/11/2021 5:12 pm
yax75 and Damiano liked
Damiano
(@damiano)
Active Member
Topic starter answered:
RE: Super pinda sensor problem - bad adhesion on first layer after sensor cool down

@bogdanh
Thanks for advices - I think I have found solution for that problem but I will check it.
I have newest firmware 4.3.3 with HW Setup option and I do setup for Smooth1 sheet and I save it. I have set the same value as on live Z adjust -1.780 mm for my configuration. I choose Smooth1 and everything started all right.
I will see after turning ON tommorow and I let You know that's the fix for that problem. 

Posted : 07/11/2021 6:28 pm
Damiano
(@damiano)
Active Member
Topic starter answered:
RE: Super pinda sensor problem - bad adhesion on first layer after sensor cool down

@bogdanh
I decided that I will set my Super Pinda sensor one again. I set it higher according instruction and now I have it on level -0.850 mm on smooth sheet  😊 
Unfortunately problem with first layer appears after finishing one print, took of the sheet and start again another print 😐 
It's very strange for me and have no idea what's the root cause of that state...

Posted : 11/11/2021 9:20 am
BogdanH
(@bogdanh)
Honorable Member
RE: Super pinda sensor problem - bad adhesion on first layer after sensor cool down

As already mentioned, some photos would be very helpful. We need to see, if hotend & SuperPINDA is assembled properly, and also show us your first layer calibration print.

[Mini+] [MK3S+BEAR]...
Posted : 11/11/2021 9:32 am
Damiano
(@damiano)
Active Member
Topic starter answered:
RE: Super pinda sensor problem - bad adhesion on first layer after sensor cool down

@bogdanh
I'm getting better result with lowering my settings to -1.000 mm 😊  It's more repeatable now with taking off sheet after print.
I'm adjusting my first layer initially with assistant from Mini+ menu (on level -0.850 mm) but when I started my print I have been used live Z adjust for more precise tuning and perfect first layer set (on level -1.000 mm).
I think that steel smooth sheet bend a little with aid of temperature and that values of height changes a little.
I will let You know after more print is that helped 😇 

 

Posted : 11/11/2021 10:59 am
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