3d Benchy Question
Ive recently got my custom printer up and running with a duet wifi and the duex expansion. Other key features are a BMG extruder w/V6. The file in question is the infamous benchy.
Layer Height- .15
Retraction Distance- 1.0mm
Retraction Speed- 30mm/s
Part Fan Speed- 0% first layer, 50% layer 3 and beyond
Material- Zylatec PETG
Accel and Jerk settings
M566 X300 Y600 Z180 E120 ; set maximum instantaneous speed changes (mm/min) M201 X500 Y500 Z20 E250 ; set accelerations (mm/s^2)
This was the first benchy printed on this machine having only printed calibration cubes before it. The print came out exceptionally well for the first real print on the machine. It had almost no stringing. However, there are two areas I'd like to fix if anyone has some input.
First and foremost the bow area has an issue. Looking at the photo, would this be from under extrusion or a part cooling issue, or something else ???? Other parts of the model show good extrusion with no holes or gaps. This makes me lean towards a cooling issue...
The other minor issue are these 3 tiny bumps on the roof. I printed a second benchy and it looks like the nozzle sat there to long. Should i increase the retraction distance? Or is there no solution to this as its just S3D way of doing things?
The reflections off of petg always make closeups look like total crap but I assure you in person these benchys look pretty amazing and zero stringing. I should primer one to dull it for more detail.
The benchy looks very small on my printer lol, like its out to sea.
cosmowave last edited by
The "not nice bow" of the benchy in the first picture seems to be a cooling issue.
I think, it's the opposite side of your cooling duct which have a bad surface.
You can try to run the cooler faster (if it is possible), improve the airflow or add a cooler on the opposite side...
@cosmowave Interesting... i will increase the fan on the next print for sure but i may also turn the model around. This isnt the best cooler and im still looking for a better design that will work with my setup.
Blacksheep99 last edited by
Agree with the cooling comment. It may be your pictures but looks like possibly over extruding as well?
Hmm, i'm not sure its over extruding and here's why i think that... i started printing 20mm calibration cubes to rough dial in the machine. the top layers were having gaps and holes. I slowly bumped up the extrusion till the tops had no gaps or holes... my extrusion multiplier right now is at 1.10. I wouldn't think that's to high but i'm no expert and is why i'm here to get some guidance.
Blacksheep99 last edited by Blacksheep99
@wingtip 1.1 is a lot in my experience, normally I'm below 1. What's your infill on those cubes? how many top layers?
Decent site for helping get this setup. Sorry if I'm teaching you to suck eggs....
edit: also, is your filament new? or at least at your sure it is dry?
It is older filament at the end of the spool..wanted to burn it up before opening another spool.
Can you post your full config.g?
The hull is definitely cooling and overhang performance issue. It's the hardest part of the model to print. I would suggest trying to print 2 of them side by side to increase the layer times and allow for more cooling. Unless you're always going to be printing single tiny boats on that giant printer I don't think it will be much of an issue.
The top surface bumps I think are likely due to excessive dwell time on retractions/travels due to the slow Z and E limits you've got set.
; config.g ; executed by the firmware on start-up ; general preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"The Big One" ; set printer name ; communications M552 S1 ; enable network M586 P0 S1 ; enable HTTP M586 P1 S0 ; disable FTP M586 P2 S0 ; disable Telnet M575 P1 S1 B57600 ; enable support for PanelDue ; drives M569 P0 S0 ; physical drive 0 goes reverse M569 P1 S0 ; physical drive 1 goes reverse M569 P2 S1 ; physical drive 2 goes forwards M569 P3 S0 ; physical drive 3 goes reverse M569 P4 S1 ; physical drive 4 goes forwards M569 P5 S0 ; physical drive 5 goes reverse M584 X0:3 Y1 Z2:5 E4 ; set drive mapping M92 X391.113 Y78.812 Z392.117 E397.022 ; set steps per mm M203 X4000 Y4000 Z800 E1200 ; set maximum speeds (mm/min) M566 X300 Y600 Z180 E120 ; set maximum instantaneous speed changes (mm/min) M201 X500 Y500 Z20 E250 ; set accelerations (mm/s^2) M906 X1400 Y1000 Z700 E1000 I30 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; set idle timeout M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation ; axis limits M208 X0:655 Y0:440 Z0:400 ; set axes min/max ; endstops M574 X1 S1 P"!xstop+!e0stop" ; configure active-high endstops for low end on X M574 Y1 S1 P"!ystop" ; configure active-high endstop for low end on Y ; Z probe M98 P"probe_config.g" ; configure Z probe by invoking gcode file ; bed heater M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 ; configure sensor 0 as thermistor on pin bedtemp M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0 M307 H0 R0.257 C549.0 D2.37 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M143 H0 S120 ; set temperature limit for heater 0 ; tool heater M308 S1 P"e1temp" Y"thermistor" T100000 B4725 C7.06e-8 ; define E1 temperature sensor M950 H1 C"e1heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1 M307 H1 R1.373 C172.7 D8.28 S1.00 V11.7 ; disable bang-bang mode for heater and set PWM limit M143 H1 S280 ; set temperature limit for heater 1 ; part cooling fan M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off ; tool cooling fan M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on ; tool 0 M563 P0 D0 H1 F0 ; define tool 0 G10 P0 X0 Y0 Z0 ; set tool axis offsets G10 P0 R0 S0 ; set tool active and standby temperatures T0 ; set tool active
I'd try these changes.
M566 E3000 P1
M201 Z200 E3000
These changes would make your extruder and z axis a bit more responsive. M566 P1 enables jerk between all move types which basically makes transitions to and from travel moves a bit quicker, which can help on those blobs on the surface.
Now might also be a good time to tube retraction and pressure advance.
I know your axis are fairly large and slow, so conservative jerk and accel on the X and Y are understandable. But you may still want to play with that a bit to see what you can get away with.
These macro files can help in live tuning things.
When the current print finishes i will upload these changes. However, what did you mean by its time to tube retraction??
tune! Not Tube.. sorry.
@wingtip what is the printing order per layer? I’m not familiar with S3D, but you can change it on other slicers. It can help overhangs if you print inner perimeter before outer perimeter. But can negatively effect the dimensions, as outer perimeter can be pushed out further if overextruding.
in S3D its called outline direction and the options are outside-in, or inside- out.
Mine is defaulted to inside-out.
The print i had going last night finally finished. I will implement some of the changes suggested in the thread now for the next print. Its very close to being dialed in. The part last night came out great and was dimensionally accurate. It had very few minor defects that doesn't affect the usability of the part at all.
Will make the changes and post the results.
I was planning on using it for detail... i care more about detail than speed. However, when i plugged in my model i built this printer for into S3D, I was quite shocked at the print time. It was like 13 days! Soooo I will more than likely break it into sections.
Here is another benchy i just finished after making some of the adjustments suggested. I also turned the benchy 90 deg to aid in the cooler nozzle hitting the bow. Those first tests again were with zylatec black petg, this is matterhackers white petg. Also older filament and white isnt the easiest to print in.
13 days... wow. You'd be surprised the detail you can get from a 0.6mm nozzle. Unless you're printing minis with very fine features.
can you even run a .6 on a v6 or would i have to switch to a volcano, which means also making another new part cooler and a new bl touch bracket.... uggg lol
@wingtip I run a 0.6 on a V6 titan aero. No problem. 10 to 12 cubic mm per sec of flow without issue. Gets me 60-70mm/s and 0.3 layer heights.
using your numbers i plugged them in to see what the time difference would be.. holy cow.. 300 hours to 55 lol.... but im worried about the detail ... i want to take this finished part and make a fiberglass mold... the .3 nozzle parts when printed look fine for the detail.... a .6 though i worry.. can you post some pics of some .6 nozzle prints??? Cause the print time does look wayyyy better.. Other wise im going to have to split this down to more manageable print times.
If you're making a mold I doubt you'll be transferring features with 0.3mm accuracy anyway? Can you share an example of what you're trying to ultimately print?
Examples of 0.6mm prints: https://forum.duet3d.com/topic/5282/my-custom-d-bot/2
I chose 0.6 because it maximizes the flow rate potential of the V6 and has a good balance of speed to detail. And it's a lot easier to tune than a volcano with a larger nozzle, that's for sure.
Let me rephrase that... its not so much transferring details but it makes for less filling and sanding for smooth surfaces where there are no details... there will still be the panel lines and indentations for holes to be drilled etc...
Well then it would depend on where you need the resolution. A small nozzle will only help on thin features or top surface X/Y details like text or slightly sharper corners. You can still use smaller layer heights with a 0.6 nozzle and still save a lot of time. I use 0.15 as my detail layer height. 0.2 ends up looking quite good as well.
Looking at the photos in that album I don't see much that would really benefit from a 0.3 nozzle.
Well after looking at my stash of nozzles i had .2's, .3's, .4's, .5's, NO .6's, and had .8's. So I installed a .5 nozzle, set the layer height to .25, the speed up to 60 and thought i'd try a benchy first.
It wasnt long before i started noticing problems. The first thing i noticed was the increased layer height was high enough that my probe was extremely close to the print. Any boogers at all and it was catching on the probe if i didnt catch them and cut them away.
Once the first layer was down and the speed really kicked in i kept an eye on the nozzle temp and sure enough it was dropping. I backed the fan down without slowing the speed for now. the temp stopped dropping but wasn't climbing either but i let it keep printing... As the print got higher the probe was dragging more and more often and eventually i just stopped the print for fear of breaking it. Problem is my bl touch cant go any higher without printing a different bracket perhaps. So is there a way to adjust the probe slightly further up into the bl touch housing???
Otherwise the print was looking pretty impressive till it started dragging through the layers. My brain needs a rest lol.