Hi All, just got my A1 2 weeks ago and its already developed the problem of the head hitting the print. I noticed it when doing a print that was about 30mm high but it didn’t seem too bad. Today I have tried a print that is 140mm high and from about half way it started hitting and this developed until at about 135mm it started hitting and dragging the filament across the print, with the result that 8 hours of printing is now scrap.
What concerns me more that the fact that there is a problem is that this appears to have been around for the best part of a year and there doesn’t appear to be any action from the manufacturer.
Does anyone from Bambu Labs read these reports?
If so where is the solution?
If there is no solution after all this time then I’ll be returning this one as unfit for purpose.
I’m having the same problem, so many prints get knocked over by my 1 week old Bambu a1 (sliced with Bambu lab) but get printed fine by my ender 3 (sliced with Cura with very similar settings).
On the a1 I can hear the friction while the nozzle moves in X-Y area and seems to touch especially while it moves over tree supports.
I think about returning the A1 and staying with my ender instead. Of course it’s slower but at least my prints never fail, like they do with my A1.
Considering that this issue is almost a year old and there’s no sign it will change, I can’t recommend anybody to buy an A1.
(note: I always cleaned the built plate with dish soap. I tried many settings and profiles, and different types of filament. I still get this problem)
Furthermore I want to add that the discussed workarounds (increase z hopping, retraction threshold to 0) are not acceptable since they increase printing time drastically.
Just avoid grid infill, or every infill pattern that crosses on the same layer and add too much plastic. The nozzle is hitting when it goes over those crossed line.