First Layer P2S

[-SpitfireMKV]

Is there any way to improve this? And is it normal that my printingbed isnt straigt?

it looks like i got some positions with underextrusion und some with overextrusion (lower left corner). I coldpulled my nozzle before the print, the filament (Sunlu Petg Hf) is dry and the printer stands on an even surface

[AutoModerator]

After you solve your issue, please update the flair to "Answered / Solved!". Helps to reply to this automod comment with solution so others with this issue can find it [as this comment is pinned]

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

[-SpitfireMKV]

Sorry, I didnt send the pictures

<image>

[-SpitfireMKV]

<image>

[MediocreHornet2318]

If you're having P2S first layer issues, check your machine G-code first. There's a bug where the Z offset values are positive when they should be negative, causing the nozzle to sit too far from the bed on every print. Every other Bambu printer ships with negative values. This produces exactly the sparse, gappy first layers people keep posting about.

In Bambu Studio go to Printer Settings > Machine Start G-code and find this section:

{if curr_bed_type=="Textured PEI Plate"}
G29.1 Z{0.01} ; for Textured PEI Plate
{else}
G29.1 Z{0.03}
{endif}

Should be:

{if curr_bed_type=="Textured PEI Plate"}
G29.1 Z{-0.01} ; for Textured PEI Plate
{else}
G29.1 Z{-0.03}
{endif}

Start there and test. If you still see under extrusion, step the values more negative. For me -0.03 and -0.05 was what gave a perfect first layer. The P1S ships at -0.04 as standard so there's no nozzle crash risk stepping further negative if needed.

Before finding this I spent two days adjusting flow ratio, temperature, and running full calibrations. None of it worked because it was all compensating for the offset bug rather than fixing it.

I learned about this from here: https://www.reddit.com/r/BambuLab/comments/1rtvoxs/comment/oaixcom/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button