Extruder destroyed the PIDA mount  

RE:

Normally this is not crashes making the model come off the bed but the model coming of the bed and resulting in crashes..

This most certainly an adhision issue and this is most certainly due to contaminated bed and/or too high fist layer. This is the most commen problem when starting to 3d-print, don't worry, this happens a lot and is a bit annoying but you will get it right eventually. Just cleean the bed with hot water and dish washing, do not touch the surface afterwards, redo the first layer calibration (you need to do that anyway after installing a new PINDA mount) and post a picutre of the resulting square still on the bed. Check https://help.prusa3d.com/article/first-layer-calibration-i3_112364 to get an idea what it should look like.

RE: Extruder destroyed the PIDA mount

Thanks,

I wound up installing a new Hotend after breaking the Super PINDA mount; based on Print Solid's advice.  Did teh install and the Pina is a credit card off the bed.  Did a calibration and got nothing but string. The frustrating part was I got a good clibration on the old one.  New is in black at -1 to -.9; old in red above.

I briefly did -1.25 and that 's teh humps in the lower part about 1/2 inch from bottom edge.

RE: Extruder destroyed the PIDA mount

Obviously still too high. You need to go lower.

RE: Extruder destroyed the PIDA mount

I would also recommend to always check up on prints after the first few layers, if everything is looking fine or if you see first signs of detachment from the bed. 

What you describe above is known as a "blob of doom", this is one of the nastiest print failures one can have and it can be prevented by almost 100% if you make sure that bed adhesion does not fail during the first 10 or so layers. If adhesion fails at a later point you want get a "blob of doom" but rather a "spaghetti monster" which is much more harmless.

RE: Extruder destroyed the PIDA mount

Posted by: @robin

Obviously still too high. You need to go lower.

Thanks. I suspected that; adjusted to -1.975 and get good prints.  Suspect I need to adjust PINDA down but for now it's working fine.

Posted by: @thejiral

I would also recommend to always check up on prints after the first few layers, if everything is looking fine or if you see first signs of detachment from the bed. 

What you describe above is known as a "blob of doom", this is one of the nastiest print failures one can have and it can be prevented by almost 100% if you make sure that bed adhesion does not fail during the first 10 or so layers. If adhesion fails at a later point you want get a "blob of doom" but rather a "spaghetti monster" which is much more harmless.

I cleaned the bed well with dish soap and long hot rinse and adjusted the z access and am getting good adhesion.  Part of my problem was the heating element wire was below the nozzle height and catching the print.  New HeatEnd fixed that.  Thanks.

One question - what is the purpose of the small enclosure it makes before the initial object is started?

Thank you both I appreciate the help as I learn my new printer.  Making Duplo numbers for grandson - never to young to start a love of math...

RE: Extruder destroyed the PIDA mount

During the first 3 layers the slicer builds a fence the purpose of which is to protect the initial layers from a draft which could cool them and cause them to come loose from the bed.  After 3 layers the print is secure enough you no longer need it.

Cheers

-Bob

RE: Extruder destroyed the PIDA mount

A side effect of that "fence" is that it does prime the nozzle at speeds and flow rate comparable to the actual print. That's just a small thing but can remove some artifacts at the starting point of the first layer. Primarily it is for that draft protection though. 

If you are bothered by it, you can remove it in the slicer settings where you also find the settings for the brim. If you have good 1st layer adhesion you might not need but it certainly doesn't harm to have it, especially if you are printing without enclosure. 

RE: Extruder destroyed the PIDA mount

Thanks. I suspected that; adjusted to -1.975 and get good prints.  Suspect I need to adjust PINDA down but for now it's working fine.

If it‘s fine, don‘t change it, if you get adhesion problems again, you might need to go lower, since the firmware will not allow more than 2.000 you will need to adjust PINDA, but you need to adjust it up. Think about it: you want the nozzle lower, so PINDA needs to trigger later, therefore it needs to be higher.

RE: Extruder destroyed the PIDA mount

Posted by: @robin

Thanks. I suspected that; adjusted to -1.975 and get good prints.  Suspect I need to adjust PINDA down but for now it's working fine.

If it‘s fine, don‘t change it, if you get adhesion problems again, you might need to go lower, since the firmware will not allow more than 2.000 you will need to adjust PINDA, but you need to adjust it up. Think about it: you want the nozzle lower, so PINDA needs to trigger later, therefore it needs to be higher.

Thanks.  I was adjusting the PINDA in the wrong direction - always closer to the surface. As my hero, Homer Simpson * would say, DOH.

* I was a nuclear plant operator at one point in my career, Pulling a Homer was our motto...

RE: Extruder destroyed the PIDA mount