I did two pulls with Taulman Bridge yesterday and solved the extrusion problems I’ve had for far too long. I’ve been limited to max 50mm/s print speed to avoid skipping steps and checked most other things I could think of. After cleaning I could easily up the speed to 160mm/s without any skipping and could probably go faster as long as the Arduino can keep up that is (speeds set in software… not verified scientifically)
Notice the wonderful brass swarf to the lower right… Eek… most likely from the manufacturing process of the nozzle for my Hexagon hotend.
I’ll definately perform this routine regularly now that I finally got the nylon.
Det ni ser på bilden är vad jag fick ut. Det går inte riktigt att se i stillbild men det där skrufset nedåt till höger är skimrande metall. Ser ut som mässing, och kommer då troligen från tillverkningen av nozzlen.
När jag fick ut det så har jag för första gången kunnat köra i lite hastighet här. Provade att öka stegvis till 160mm/s och det fungerade utan strul. Helt fantastiskt!!!. Nu var kanske inte modellen stor nog att nå max hastighet men det gick verkligen undan. Så j-vla gôtt!
För övrigt är jag imponerad av http://www.3dprima.com . Jag beställde igår vid lunch. Fick faktura i mailen efter ca 5 min. Och kunde hämta ut paketet idag på lunchen!
He doesn’t clearly explain how to do it. I guess you heat the 618 up normally then cool it down to the “pull temp”. Do you pull it out with the extruder motor or by hand or does it not matter? If by the extruder motor does it have to be particular speed?
It should’t really matter as long as it works. If the extruder is strong enough I guess you could back it out using the motor. It might depend on the contruction of your hotend too and how hard the nylon “bites” into it. On my Bulldog XL extruder I just pushed the idler tensioner in to free the filament and pulled it by hand.
Edit: As default Marlin (and other firmwares?) will not let you cold extrude so you will have to issue the appropriate G-code first to allow reversing at 140C.
Giving this a go now. Pulling out a bit of stuff. Not too bad though.
One thing I noticed, though, once you set the extruder to the “cold pull temp” you have to keep pushing the 618 through a bit. Otherwise it will oose. When that happens the central part of the nylon will ooze through and leave a bit of a tube of nylon and it won’t grip anything to clean out.
So keep slowly pushing it through until the hot end cools to just under 200 degrees C. Then it should stop oozing.
@Ben_Jackson good tip! I didn’t really notice any ooze with Taulman Bridge and my Hexagon but I’ll give it a try anyway and see if there is any gunk left. It makes sense.
