Starting a Print Sequence

Jpmc86

Hi all. I’ve been having issues with my delta and the first layer. Seems to always be a hit or miss. I have an FSR probing system.

My current procedure is, start the printer, heat the bed up to temp and then run auto cal. Once that’s done, heat the nozzle and start print.

Am I supposed to manually set z=0 via the G92 function at first? I currently never do this and find that sometimes baby steps helps and sometimes it doesn’t.

Can we post up a step by step procedure of what should be done?

Thanks!

Jpmc86

Do we have to manually tell the printer what z=0 by command when I trap a paper between the bed and the nozzle?

dc42

No, if you have set up your FSR probing system correctly, then you can probe just before printing and the firmware will know where Z=0 is. You need to tell the firmware what the trigger height of the Z probe system is in the G31 Z parameter. For FSRs it will be slightly negative, e.g. -0.1 or -0.2mm.

Jpmc86

@dc42 said in Starting a Print Sequence:

No, if you have set up your FSR probing system correctly, then you can probe just before printing and the firmware will know where Z=0 is. You need to tell the firmware what the trigger height of the Z probe system is in the G31 Z parameter. For FSRs it will be slightly negative, e.g. -0.1 or -0.2mm.

Thanks David for the clarification. Now should I be doing this when the plate is hot?

I’ve done this and it seems as if every single time I start a build my nozzle is either too high or too low.

dc42

FSRs don't like heat; but if they are sufficiently well insulated from the bed then it is better to probe with the bed hot in case it changes shape.