@oliof of course it is .
many industrial motion systems use h bot . startasys used hbot in their printers . it all depends how rigid your design is .
Best posts made by hackinistrator
RE: Ringing on prints
print 2 cylinders (like you did in your images) while one is twice in diameter .
compare the pitch distance on both cylinders .
if its the same - you have problem with your leadscrews , probably one of them bent .
if the pitch is different for the larger cylinder then you have temp / extruder issue .
RE: An idea for a funding model for Duet firmware - discuss.
I think , at some point open source becomes pointless .
And , i think RRF already reached that stage .
Lets take marlin for example (i didn't use RRF at its early stages) , i remember the days when i tweaked the code to add sensors / change thermistor tables and other settings and felt like a superman .
Or the days when some of us tweaked android phones with custom firmware builds .
It was fun and all , but today at this stage , i never touched RRF source code and never tweaked it .
Same for my android phone , last time i had a phone with an open bootloader was about 10 years ago .
After years of development , the software grows so big , complicated and feature packed that it becomes a real pita / needless to touch it .
So whats the point of the software to be open source at this stage ?
its only relevant to about 0.001% of total userbase , probably less.
RE: Poor print quality with RRF3 - especially 3.2.2.
How do you explain the print to print variability when nothing changes between prints - not even the filament?
firmware also didn't change between those prints .
i'm not saying the firmware is perfect . I'm just starting with duet3 and i can say that so far with all the various (minor) issues i had , the diagnostics (m122) was pretty much useless in my case .
i also didn't like the default homing files , which mark axis as homed even if i dont have a sensor attached to the board (no sensor = NO = HOMED...) . this could potentially cause damage as i'm using large high current motors .
back to topic ,
your print has no layer shifts , so i guess the problem is extrusion related .
if i were you , the first thing i would change is the filament . if you didn't print for 19 months , i guess that pla is more then 19 months old . pla degrades over time and its the easiest thing to change .that curling is good indication of degraded filament (if temps were ok).
next i would test extrusion / retraction (including firmware )
for example extrude 11mm and retract 1mm 10 times , measure if total is 100 . do this with various feed rates until you reach approx 1.5x your max printing feed rate.
if you think its something related to multi axis/ stepper movement then you can add movements during this test .
your test print is pretty large , i would use something smaller for tests , even benchy would be better .
RE: Vertical lines vs. geared extruders
this guy is doing great analysis of this issue
it looks like he also thinks (like me) that this comes from direct drive dual gear extruders . i'm waiting for the next vid to see his conclusion .
multiple heaters for single chamber
i would like the ability to control several heaters for single chamber .
for example , if i'm using 2 heaters , one on top , and one at the bottom of the chamber .
at the beginning of the print , the bed is up - i dont need the lower heater to waste power (maybe set it to lower temp).
when printing progresses , and my bed is reaching the lower chamber section , i would like to add the second chamber heater.
display of multiple chamber temp sensors in dwc would also be nice . connecting them in series or parallel is not my preferred solution .
RE: Bug? In Retraction and Movement Junction
currently my only running machine is a modified prusa mk2 . still using marlin .
if i'm using retraction , its easy to tune the seam to be a bulge or a void . invisible seam is impossible .
i dont see how its not tunable with rrf , same way it is with marlin .
i will try to connect it to duet board and compare.
RE: Trianglelab Matrix Extruder somebody?
i dont like how the heater block is held only by the tiny surgical tube .
this tube is press fit bi metal . i have this kind of tube on v6 , also made by trianglelab and i can spin the heater block while holding the cold side .
RE: Ringing on prints
i set very conservative acceleration and jerk setting in the profile i sent you (i thought you are limited to 20mm/s from your original profile) . in S3d those values are under post processing script , as this 150$ software didn't add simple acceleration and jerk settings
i also think you should move away from s3d as they are going nowhere it seems .
for easy transition you can try ideamaker .
as much as i hate S3D as a company , i still find it useful for multi process and sequential printing .other then that , prusaslicer , ideamaker and cura , all of them much better now .
Latest posts made by hackinistrator
RE: Mushrooming print - What could cause this?
Definitely could be. I double checked with an IR thermometer and got ~5°c off the printer's reading (which is good for an unknown emissivity, I'd say...). Can't find my multimeter's thermocouple at the moment but I will double check it.
However I think there is a possibility that the readings are accurate and the cause for the different behavior might be:
- High temperature inside the chamber (4 of the 6 walls are double aluminum panels with an air gap between them for better insulation, and the remaining doors are thick glass panels)
- Reflective aluminum walls bouncing the IR radiation from the oversized bed back to part to be absorbed.
i suggest you measure the bed temp with a thermocouple + multimeter . some of the parts look completely melted (way higher then 100c) . my chamber temp is higher then 50c , its around 60 .at work i have stratasys printer thats prints abs with 90c chamber and nothing like that is happening .
your bed is huge , maybe the heat is uneven . also its worth checking the nozzle temp with external measurement
RE: Heating Chamber for a 3d printer!
@rexx it has nothing to do with mains freq . its the pwm switching freq .
heated beds and chamber heaters that are powered by mains usually use low switching freq , around 10hz .
also it will able you to see what's actually going on (led lights on when out on) .
i don't know what type of ssr you are using , some of them can't work at high freq , and some can . default freq is 250hz if you don't use the q parameter .
RE: What conditions cause "Phase A may be disconnected" error
if you ran the printer for a year , probable cause might be breakage inside the extruder motor wires due to repetitive flex of the wires .
i think its best to change the cables , they're cheap.
RE: Nema 23 Backlash on direction change
that's allot of "something" you're moving there .
did you consider leadscrews ?
at what voltage are you running the motors?
so let me get this straight , just to move your axis you need 2NM , which is close to the rated max holding torque of the motor .
while changing direction the torque needed might be 10 times more , depends on your max speed , accel and jerk setting.