Failed First Layer and completely molten Extruderunit.
Hello,
I have Problems with my first Layer. It doesn‘t geht smooth, no matter how I change the disance of the noozle to the bed.
I wanted to see if this is just a first layer problem and started a first print. I can‘t exactly say what happened, but the Prusament had completely molten around the Extruderunit.
This is my fourth Kit that I build and I can‘t the any real difference in the way I build it. So I have absolutely no clue what went so terribly wrong.
I hope, someone here has a good idea.
Regards,
Dennis
RE: Failed First Layer and completely molten Extruderunit.
Hello
It looks like you have the textured sheet?
Although it does apparently work its not the best for pla, The smooth pei sheet is far easier to work with, I suspect you have had poor adhesion for that to happen. (Print knocked off the ged)
Is recomended to wash it with soap (dawn/fairy) rinse well, dry well, dont touch the print surface and then heat on the bed immediately to dry and stop rusting.
Also, its hard to see, but looks like your first layer maybe too low (tell tale ragged lumps where the nozzle has dragged the filament.
Clean the sheet as above (if its textured) and run jeff jordans life adjust my way.
Tank you very much!
RE: Failed First Layer and completely molten Extruderunit.
PS These lumps/raised sections on a second look could also be poor adhesion related.
Tank you very much!
RE: Failed First Layer and completely molten Extruderunit.
That cleanup won't be so bad. Doesn't look like anythign is broken. Heat it up to the temperature one grade higher than the stuff you were printing, and it will start to soften and drip. Then raise up the head and carefully start picking away with tweezers and needle nose pliers while it is still hot - use preheat so you can stay hot for a while.
Then take off the nozzle cooling fan and remove the fan shroud - then remove the hot end cooling fan - carefully, so the wires don't break since you will need a place to hang the fan (service shelf is beautiful print/tool for this job). Then keep picking - remove any globs that are stuck to your fans or fan shroud. Make sure your fan shroud is not broken - if it is, order another one. I keep a fan shroud in spare - you will go through them.
RE: Failed First Layer and completely molten Extruderunit.
@clarmrrsn
Thanks for your response.
Yes, I ordered them with the powdered bed because I thought, that the adhesion should be ok and I like the look of the printed surface of the powdered bed prints. My first three printers have the standard steel bed and didn´t have the problem.
I adjusted Z-Layer with the 3x3_cali_rl_02mm_pla_mk3s_30m Print and it felt like there was only the option "less adhesion" or "small raised sections".
I have here 12 Kits with the powdered bed and mostly print in PLA. Have I done something terribly wrong, or is there a chance I don´t have to buy another 12 standard steele sheeds?
Regards
RE: Failed First Layer and completely molten Extruderunit.
I switched to the 7x7 mesh leveling from the 3x3. Gets you a much better topology map of the bed - and the software helps adjust the Z automatically
RE: Failed First Layer and completely molten Extruderunit.
That cleanup won't be so bad. Doesn't look like anythign is broken. Heat it up to the temperature one grade higher than the stuff you were printing, and it will start to soften and drip. Then raise up the head and carefully start picking away with tweezers and needle nose pliers while it is still hot - use preheat so you can stay hot for a while.
Then take off the nozzle cooling fan and remove the fan shroud - then remove the hot end cooling fan - carefully, so the wires don't break since you will need a place to hang the fan (service shelf is beautiful print/tool for this job). Then keep picking - remove any globs that are stuck to your fans or fan shroud. Make sure your fan shroud is not broken - if it is, order another one. I keep a fan shroud in spare - you will go through them.
It seems I already messed it up. The Hotend termistor Cable is broken and so the whole thing won´t heat up. I´m ordering several for the future, but thank you for your description, how I could make it better next time. I fear it hasn´t been the last time I will need this advice.
Do I miss something, or ist there no troubleshooting part for the way to disassemble the hotend with the cable? I would prefere to fix that part and don´t have to buy another whole assembled hotend E3D.
Regards
RE: Failed First Layer and completely molten Extruderunit.
Here is the procedure for thermistor replace, its not too bad a job.
https://help.prusa3d.com/en/guide/how-to-replace-a-hotend-thermistor-mk3s-mk3s_131675
And yes, the cables are very delicate, as it seems you were unfortunate enough to find out the hard way.
When I had a large glob around the hotend I made sure I heated the hotend, then waited a while before attempting removal so it gets a good chance to melt, got the worst off with assist of small sidecutters to avoid pulling the cables, then around the cables I used great care, and very carefully used a small metal pick to gently press the filament between the block and wires against the block to melt it before removal.
Regarding the textured sheet, it is great for other filaments but not ideal for PLA, It can work for PLA but adhesion is apparently more tricky, I have put off buying one till I am 100% used to printing PLA on PEI.
https://help.prusa3d.com/en/article/textured-steel-sheet_196534
The above article might help, but if its mostly PLA you will be using maybe consider order a smooth PEI sheet when getting the thermistor, it is a joy to print with PLA on it, adhesion is superb.
Tank you very much!
RE: Failed First Layer and completely molten Extruderunit.
Your picture, it looks like your first layer is to low. And then sticking to bed will be not as good.
To prevent sticking to nozzle or get a big plate of spaghetti , this is important:
1. Clean bed, use dish soap with a lot of hot water. Depends on bed and model, you can do a few prints with alcohol, but dish soap is the best.
2. First layer needs to be 100%, this needed for sticking, and to get a good print higher up.
Powder coated bed, do not use pla, get a pei sheet. Use 7x7 setting in the printer for calibration. Use a big brim if needed for some models.
If you get confused with you first layer, clean the bed with dish soap, print a few squares, then start the first layer to high and lower it step by step, then you see the good setting.