Have you made the designs for your winder available?]]> Have you made the designs for your winder available?]]>So it seems i have run motor to fast. I will have to do some more testing.
I really hope this was it.. and some tweaking should get it better.
On the left, old filament, right is the new extruded with 8rpm.
]]>I also had (not anymore) a slow starting/stopping circuit for the motor, but the board blow and i didn't make a new one .
Now it just start and stop.
The threaded rod has 3mm pitch, but should be 2.85 instead (i made it for 3mm filaments).
The timing belt was originally for toothed gears, but the belt slippd all the time, so now i have crowned wheels instead. They never wonder off.
The belt is ninjaflex.
The thermocouple is mounted at the side of the heatchamber inside a drilled hole with thermalgrease.
Edit: i am going to try even lower motorspeed and lower temps today. I have been running motor over 9-10rpm..
so maybe it's that.
ABS i run it at 12-20rpm without problems.
2 heatzones separately controlled by PID controller. 20mm diameter barrel and 20mm auger. Total lenght of barrel+heaterzones is about 20cm.
Auger run by a 1/4hp motor controlled with a variable frequency drive with TOTAL control of motorspeed regardless of load.
But as i have moved on to PLA problems came quick.
I run vertical, and have tried 45degree tilting, but filament comes out all between 2.20-2.8 no matter what i do.
It goes in constant waves at about 1-1.5m.
Cooled by a big 120mm fan, just right at the nozzle. I have tried ducting airflow, no ducting, one 120mm fan and two 60mm
fans direct after the big and coiling to the floor. No difference.
I have a homemade winder that goes on/off controlled from a readingfork the filament goes through. Thought first that it was becuase the on/off'ing of motor and swinging filament , but coiling to the floor is the same.
Predrying PLA for 4-5hours in oven, tried both with and without PLA colorant.
Different speeds and temps but the same waving in diameter, just different lenghts. Always consistent waving.
Read a hint that auger perhaps too far from nozzle so i tried an auger that was longer (end 3-5mm from nozzle)(previous auger ended 30mm from nozzle) no difference.
Tried cutting auger at 45 degree angle at the tip (previous 90 degrees(straight cut)) no difference.
There is ONE thing i think is the cause of my problem, but i am not 100% sure.
If i take off the nozzle and run the extruder i can see that the molten plastic is slowly pulsating out from the heater.
I am not sure WHY it does so, and if this could be my problem (varying pressure?) or how to fix it.
Or do i have too short barrel?
Anybody have any tips? Or am i the only one who have experinced this?
I don't want to give up because i like to print with PLA much more than ABS.
I am uploading a video to youtube now but it will take more than an hour to upload 