Hi everybody,
I wanted to print the same object as yesterday a second time, will say, all the settings were approved. Now my P1S moves the head to the wrong position. I have already done a factory reset. After that the print head was in the correct position. But when I started the print, it moved forward, crashed against the front side and moved back again to the wrong position, approx. 5cm to far left and 2 cm to far in direction to the front.
P1S is in original state, no modifications except a second LED strip for better light.
Thanks in advance for an idea to solve.
You did not update the firmware in the meantime, did you ?
I did, some days before, but the printer worked a few days normally.
You have not installed one of those makerworkd motor dust covers by any chance ?
Welcome to the forum.
Make sure that you can manually move the head to the front right corner. If for example the PTFE tube is too short it will not allow the head to home correctly and will offset where the head purges.
No modificatons at all. No additional parts.
Do you think, the new firmware could cause the problem?
I didnāt change anything (but the firmware) during the last few weeks.
Have you tried a factory reset yet? Often that will fix the weird problems.
I would still suggest you manually move the head to the front right corner to see if anything is blocking it.
I gave up on thinking with Bambu 
All I know is that (so far) there were always people with issues after updating the firmware.
Be it that their old 3MF refuse to produce the expected result, the printer or communication misbehaving or just things that worked fine before suddenly causing headaches.
If you ask me than Bambu is rushing things far too much - quantity over quality is not the way to go if you want satisfied customers.
I am still happy using the the firmware from before the Auth āupdateā together with the matching Studio version.
I know what to expect, I know the flaws and downsides and I get the prints coming out fine as planned.
While I understand the need to have the latest and best - in the Bambu world the latest only too often is fundamentally flawed - just MY opinion on the matterā¦
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How is the extra light strip you mentioned powered?
@Wsquared58 Itās a Panda Lux LED strip powered by th free USB port i P1P.
@JonRaymond
Now I moved th head several times in all the four corners. After this, the homeing got well. I tried another print, it startet fine, but with an offset. (See the blue line in the front). After the first filament change, the print continued in the correct place (dark blue).
@user_3026326371
How can I downgrade the firmware? If I try to get an older version, I get the message:
no content available yet.
@all the friendly users, who will help me:
Please be patient, I am 74 years old and my health condition is not the best for the last few days, so I cannot verify your tipps and answer your questions immediately. So far, greetings from Austria, the heart of Europe
I had an idea when you said you added those lights I was going to get the answer you gave me.
Unplug the lights and see if the situation clears up.
Several people on this forum have had issues with those Panda Lux lights. The problem isnāt the lights as much as that USB-A socket canāt handle the volts/amps the lights require and it is a recipe for trouble.
ESPECIALLY if you see that multi-socket connector that comes with the Panda Luxe and assume it must be okay to plug in both the stock light AND the Panda Luxe. Because, why would BTT do that? 
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I installed Panda LUX in January and printed about 200 h in between. I assume more a mechanical problem maybe with the belt. I will do further research on weekend.
Do you have both lights plugged in to the multi-socket connector that came with the Luxe?
Search this forum using āPanda Luxā as your search phrase. Lots of people have had lots of problems with that light and the Touch.