Hi all,
I’m troubleshooting an issue where my nozzle hits the infill on tall prints, causing problems mid-print. I ran a z-offset calibration test (attached photo) with nine disks labeled from -0.08 to -0.12 mm, plus 0.04 (Default). The disks show varying layer lines and surface quality, but I’m unsure which z-offset is optimal to prevent the issue while keeping good adhesion.
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Printer Model: [Bambu A1]
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Slicer Settings: [Nozzle temp 225, 75°C Textured PEI plate]
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Filament: [PETG, Sunlu]
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Photo: Attached
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.3mf File: [I am using this file from makerworld that i just modified myself to have everything on one plate, i printed them one at a time and changed the Z-Offset for each one]
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Extra Info: Some disks look smoother (e.g., -0.08 mm), but others have more visible lines or bumps. Any tips on picking the best z-offset would be awesome!
Thanks!
Negative zoffset means closer to the bed, if you are having nozzle hitting problems then making it even lower can’t possibly solve the issue.
I saw that file too and the creator makes it seem like you always want to make the nozzle closer, in some cases you might need it farther away. In other cases probably most of the time this isn’t something that needs to be messed with as everything works fine by default usually. Also not sure if this can solve the problem. I’ve been messing with positive z offset and that mostly fixes my bad first layer problem, but hasn’t done anything to stop nozzle knocking including when I use it with all the other popular fixes people name all the time. (Gyroid infill, don’t cross walls, zhop settings, and disabling reduce infill retraction).
Z offset isn’t causing your issues. It is mostly due to grid infill because it crosses over itself so a slight warping can cause scratching. Try using gyroid or another infill pattern
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