Rat Rig Community [Unofficial]•2w ago

First layer issues on larger prints only

I am having issues on first layer with large prints - usually the second half or so VC4 500 IDEX - Ti Tube - Latest RatOS - 0.5 Undertaker TC Nozzle Helge's beacon guide followed and beacon compensation enabled I will attach pictures of the failures, immediately after this issue on the large print, I put the first layer test print in the exact spot the large print had started failing and the first layer rectangle test print finished and looked great. I can also fill the bed with smaller objects and they generally print fine. Bed was cleaned with 91% iso before this print If anyone has any ideas Id appreciate it

ratos-variables.cfg

RatOS.cfg

printer.cfg

10 Replies

Unorthad0xOP•2w ago

Beacon Compensation mesh

Unorthad0xOP•2w ago

First layer test printed exactly where print started failing, right after failure

Unorthad0xOP•2w ago

@Helge Keck If you get a chance to look at this Id appreciate it!

Helge Keck•2w ago

add this to your printer.cfg and try again

[gcode_macro RatOS]
variable_bed_heat_soak_time: 1200
variable_hotend_heat_soak_time: 300
variable_start_print_park_in: 'primeblob'

[gcode_macro RatOS]
variable_bed_heat_soak_time: 1200
variable_hotend_heat_soak_time: 300
variable_start_print_park_in: 'primeblob'

this will take some time until everything starts, goal is to rule any thermal expansion issues out

Unorthad0xOP•2w ago

I will try this after work today and report back - I was using 600 and 240 but I commented it out as I had been manually preheating/printing back to back. I also completely redid beacon calibration after this print failed the first time, these pics were second attempt after the recalibration and a iso plate cleaning Thanks Helge - this seems to have done the trick. Coming from Bambus Ill just have to get used to the wait I suppose. Did start getting infill issues as I went higher seemingly due to underextrusion, even at 230 I am having trouble pushing over about 28mm flowrate with pla and a 0.5 on these larger prints. I was expecting much higher as I run 22 on my x1s with 0.4s. Is this because of the long filament path? I do hear a clicking noise from the orbiter which seems to coincide with missing sections of infill, this almost completely goes away when I lower the speed factor about 10% More info Im not sure if of any merit - I often see the EM on ratrig is .92-.93, I am running .97-.98 on everything Ive tuned and around .02 pa

Unorthad0xOP•2w ago

Further lowered speed factor to 80% and 0 clicking or holes. Odd as I was able to achieve much higher flow rates in orca flow test. 80% puts me at 19.5 mm^3

blacksmithforlife•2w ago

the faster you go the more heat you need, bump it up over 230 and you probably will stop having the issue

Unorthad0xOP•2w ago

Yup, at about 240 this issue goes away and I can run 28mm/s no problem. Seems pretty dang high for only 28 though

blacksmithforlife•2w ago

Depends on the filament But with these high speed printers you basically ignore the recommended temps as they are for slow bed slinger types

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First layer issues on larger prints only