Issue sticking to the bed  

RE: Issue sticking to the bed

A picture says more than a thousand words…

RE: Issue sticking to the bed

And what is the nozzle size you were questioning?

RE: Issue sticking to the bed

it feels like it is lower than a 0.4 nozzle ,,,,but i think i am just dreaming 

Ill post picture in a little while 

Thanks for your reply

RE: Issue sticking to the bed

If you move extruder to a high position, and extrude filament, see if the line is straight, thick enough, it could be a partial clog .

Try printing hotter, every filament is different.

And of course a picture of the first layer.

If first layer does not work, I do this:

Clean bed with dish soap, use a lot of hot water, clean a few times, dry the bed and use it directly  on the hot printer, to prevent corrosion.

Then start with a to high z-layer, then lower it with little steps, this  to prevent to go to low(I usually go to low without I see it myself).

Print a few cubes so you can adjust the cubes with different settings.

RE: Issue sticking to the bed

With the hot end did you make sure the ptfe tube was not moving before install, I almost missed this as not in the manual.

There is a comment that links to replace the PTFE tube guide, I believe this step is crucial so really should be in the manual.  You need to lock the tube with the collet so it does not move.  Step 8.

https://help.prusa3d.com/en/guide/how-to-replace-a-ptfe-tube-mk3s-mk2-5s-mmu2s_21664

Could this could cause blocking if the ptfe is moving?

RE: Issue sticking to the bed

I'm betting you need to clean the bed properly or Z is to high, however as fuchsr said, "A picture says more than a thousand words…" we have nothing to go by.

RE: Issue sticking to the bed

@clarmrrsn

Thanks for the reply

To be honest i do not remember seeing this step at all, i built the kit using the online guide.

I hope my video helps diagnose the issue, i have cleaned the bed so much im sure im wearing out out lol

My guess was it was something to do with the extruder so you may  have hit on it  

https://forum.prusa3d.com/wp-content/uploads/2021/03/20210320_112723_001.mp4

RE: Issue sticking to the bed

Every printer needs to go lower, you are doing nothing, if you turn it lower, you need to press a little on the filament.

The square lines are not sqaure (corners), that means you need to go down/lower.

Search on youtube how a line should look like.

Prusa manual they have pictures.

RE: Issue sticking to the bed

Thanks for the video.

First of all, forget about the built-in calibration approach, it's okay to get you into the right ball park but it's hard to get it right using this tiny square. Follow this approach instead: https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/  

Second, the Live Z of -.005 you have is certainly no good. You should be somewhere around -1. That is, IF the PINDA is correctly positioned, you'll need to go a lot closer to the bed (more negative Live Z). Again the link above will show you what a good first layer looks like. This certainly explains why nothing is sticking.

Now, if you really get the best layer at about 0, which I heavily doubt, you should adjust the height of the PINDA. If you have a Mk3S, the distance between the PINDA and the steel sheet, when the nozzle just touches it should be around 0.8--1 mm, about the thickness of a zip tie. If you have a Mk3S+, the SPINDA needs to be higher, at around 1.5mm.

But at this point, I think it's just a matter of adjusting your Live Z. It always starts at 0 but you'll have to lower it (make the number more negative) until you have the filament stick and no gaps between the lines. All well explained in the link above.

You'll be in business in no time!

RE: Issue sticking to the bed

And just to add: You may have to adjust your Live Z in case you change a nozzle or make changes to the hotend. Or if you switch from smooth to textured sheets, as the textured sheets are thinner and thus require lower Live Z. Getting Live Z right is the one thing that will make all the difference in your prints -- short of not touching the sheet with your fingers and keeping it clean.  The good thing is, it's really easy once you know how to do it.

Oh, and make sure 7x7 mesh bed leveling is turned on.

RE: Issue sticking to the bed

Thank you for your help again. its given me somewhere to start 

All going well ill let you know how i go, "Great instructions" 

RE: Issue sticking to the bed

@dazza

Another handy hint that really helped me is, when running "Life adjust Z my way" keep working it down like fusher says until it looks like all the lines are joined together with no gaps, when you think you have that try your hardest to pull the lines apart on the 75mmx75mm square, if you can separate the lines, you are not low enough , go a bit further. (Watch the 2 perimeter lines as well, I found they can be the easiest to see joining together).

It needs to form 1 complete solid surface, just keep going down a bit at a time, it took me quite a while to fine tune my first layer, don't rush, it is the most important part of the print.

This is a very good clear illustration of what you are looking for.  Printed on a different glass bed but shows clearly too high and too low, and the issues they will present.

What knowledge is necessary to use a 3D printer? - CADDesignhelp.com

RE: Issue sticking to the bed

Well i did every bit of advice that you have given me, realized that my PINDA was way to high as suggested, i manually adjusted it twice and on the second try hit the perfect height.

Bottom surface or models are smooth and sticking so well, i am amazed.

I thank you all again for your help and understanding as i am new to Prusa  

RE: Issue sticking to the bed

Great to hear it worked!

Yeah, it takes a while to get Live Z right but it's all so much easier than the crap I had to go through with my pre-Prusa printers to get decent bed leveling and good adhesion.

RE: Issue sticking to the bed

my pre-prusa  printers were Stratasys and Formlabs designed to point and click, so their WAS  learning curve but one I was happy to achieve.

RE: Issue sticking to the bed

mine was a Tevo Black widow,,, yes the house didnt burn down, but i do have plans to convert it into a large , maybe Prusa parts on a large sturdy frame.

With upgraded fittings and Prusa technology it could a good thing for larger models  

RE: Issue sticking to the bed

@dazza

Everyone has to start somewhere.  Don’t let frustration get you down, come back and post your problem and the community will assist.  

RE: Issue sticking to the bed

Took me about a full day to fine tune my first layer, now I know exactly what I am looking for should be plain sailing.

And yes, I had exactly the same on the ender, thr old hit and miss first layer.