Failed print after power supply failure  

Re: Failed print after power supply failure

Do a full XYZ calibration. You might have disturbed something while replacing the PSU.

BTW, I have measured mine using 300W while warming up. The stock PSU is only rated for 240W continuous (no mention of peak) so it's undersized. A workaround is to preheat just the bed first, in order to lower the peak, but they really should have put in a better PSU with plenty of headroom for upgrades.

Re: Failed print after power supply failure

Thanks. I did the full xyz calibration twice and it hasn’t fixed it.

Re: Failed print after power supply failure

Your problem has two reasons, clean the bed (preferably with soap solution) and do the correct Z-level calibration.

Re: Failed print after power supply failure

Thanks. I tried cleaning the bed with acetone and rerunning calibration again. The prints still fail. The first layer won’t tick and it almost looks like the plastic is coming out too thin. Like I am not getting enough filament through the nozzle. When it first lays down the bit of plastic to clean the nozzle it’s noce and thick and adheres well. Then running the first layer calibration the plastic gets real thin and won’t adhere well and I get the uneven printing,

Re: Failed print after power supply failure

Why don´t you just give it a try with some dish washing liquid, like RHDreambox said.
That worked wonders for me.
No adhesion problems at all since i do it that way.

Re: Failed print after power supply failure

The first layer won’t tick and it almost looks like the plastic is coming out too thin. Like I am not getting enough filament through the nozzle.

Yes the string should be thin. If you compare with a regular A4 paper, the string should be 2 paper high (= 0.2 mm) and 4 paper wide (= 0.4 mm).
In your picture it appears that the string is 0.4 mm high.

Re: Failed print after power supply failure

Thanks for the help, all. I think I figured out that I simply wasn’t cranking the nozzle down nearly enough on the first layer calibration. Silly me, I was reading .1mm as 1mm and thinking I was getting near the limit. Cranked it was down (to about .535mm) and it looks much better. Have an early morning tomorrow so I couldn’t do a test print but cross your fingers that it’s just that I’m an idiot.

Re: Failed print after power supply failure

Do a full XYZ calibration. You might have disturbed something while replacing the PSU.

BTW, I have measured mine using 300W while warming up. The stock PSU is only rated for 240W continuous (no mention of peak) so it's undersized. A workaround is to preheat just the bed first, in order to lower the peak, but they really should have put in a better PSU with plenty of headroom for upgrades.

Hi NiHaoMika,
how were you measuring the power utilisation?

the rated power for the power supply is 240 watts output,
there will be losses inside the power supply,
peak efficiency is rarely achieved at or close to full load,

If this were a Meanwell Powersupply the peak efficiency could be in the order of 78% to 89% (based on the LRS series)
at 78% efficiency, the power input could be in the region of 308 watts...

therefore if you are measuring the input power, it is reasonable that you maybe seeing 300 watts input power being consumed.

regards Joan

Re: Failed print after power supply failure

I'm using a TP-Link smart plug with built in power measurement. Do note that for those looking to buy one, the Android app works great while the iOS app doesn't measure power properly. It has been like that for well over a year.

Working on PCs, rule of thumb is that the power measurement using a smart plug should never be more than the rating of the PSU. The efficiency being less than 100% provides some margin.