Conversation started on Friday, January 31 2020, 14:57
[15:06] Customer : hi, i want to check estep but when i ask for 100mm, i have 30mm extrusion
[15:06] Bondtech has joined the conversation.
[15:06] Bondtech : Hi
[15:07] Bondtech : Are you using one of our products?
[15:07] Customer : yes bondtech extruder for cr10v2
[15:07] Bondtech : Ok, did you purchase the extruder from us?
[15:07] Customer : yes
[15:08] Bondtech : Have you got an order number or an e-mail so i can check your order?
[15:08] Customer : yes check to ***
[15:09] Bondtech : Ok, found it!
[15:11] Customer : i use Simplify3D to drive the machine. when i ask 100 mm the filament won’t move or if i tight the screw, it extrude 30mm
[15:11] Bondtech : Did you follow the installation guide?
[15:11] Bondtech : https://support.bondtech.se/Guide/01.+BMG+for+Creality+CR-10+V2+-+Installation/53
[15:11] Customer : yes my estep are 415
[15:11] Bondtech : Ok good.
[15:12] Bondtech : But if it only extrudes 30 mm it means that the e-steps is not correctly set and saved.
[15:12] Bondtech : Are you connected to the printer now?
[15:12] Customer : yes
[15:12] Bondtech : Good, i will help you
[15:13] Bondtech : If you start Simplify3D then select Tools / Machine Control panel
[15:13] Customer : ok
[15:13] Bondtech : Then you connect to the printer
[15:13] Customer : done
[15:14] Bondtech : Once you are connected send M503 to the printer.
[15:14] Bondtech : This will make the printer to show all its settings, copy the output and paste it inhere.
[15:15] Customer :
[15:17] Bondtech : There should be a line containing M92, do you see it if you scroll up?
[15:17] Customer : it’s so difficult to see with S3D
[15:17] Customer : i try
[15:18] Bondtech :
[15:18] Bondtech : You should be able to scroll up using the handle marked in red…
[15:22] Customer : no it’s move
[15:22] Customer : so much
[15:22] Customer : ok i ve seen it’s e415
[15:22] Bondtech : 415 is the correct e-step value
[15:23] Customer :
[15:23] Customer : acceleration?
[15:23] Bondtech : Acceleration does not have that big impact use 3000 mm/s2.
[15:26] Bondtech : So did you try to print a part? Start with something simple like a cube 20x20x20 mm
[15:27] Customer : ok, when i charge filament , i ask 100, i have 99mm more or less
[15:28] Customer : without touching nozzle
[15:28] Customer : i use nozzle x 0.4
[15:28] Customer : and i start to think it’s really crap
[15:29] Customer : i’ve made 2 prints, one with brass , print ok, not bad
[15:29] Customer : 2nd with nozzle x , i’m under-extruding
[15:36] Customer : it seems ask 100mm and extrude 100 is impossible
[15:36] Customer : 10*10mm, it’s not bad
[15:37] Bondtech : Ok, did you increase the temp of the hotend when using nozzle X?
[15:37] Customer : yes
[15:37] Customer : 20°
[15:37] Customer : 240 for petg
[15:37] Bondtech : Ok, what speed are you using when extruding this 100 mm ?
[15:38] Customer : usually 215 is good
[15:38] Customer : 16.7
[15:38] Bondtech : 16.7 mm/second ?
[15:38] Customer : yes
[15:39] Bondtech : Ok, so 16.7 mm/second equals to 16.7 * 2.40 =40 mm3/ second.
[15:39] Bondtech : That is much too fast, the hotend does not have that high melting capacity.
[15:40] Bondtech : This is what is causing your issue.
[15:40] Customer : so i use how much?
[15:40] Bondtech : I would recommend to stay under 10 mm3/ second that equals to 4.2 mm/sec
[15:41] Customer : ok i try
[15:41] Bondtech : each mm of filament contains 2.4 mm3 of plastic.
[15:41] Customer : ok is it a value i can store by gcode?
[15:42] Bondtech : Nope…
it is the area of the filament * height (r*r*Pi) = 0.875*0.875*3.14159 = 2.40
[15:44] Customer : OK understand
[15:44] Customer : better now i ask 100, i have 90mm
[15:44] Bondtech : If you are printing with a 0.4 mm nozzle and want to max push out 10 mm3, then if using 0.25 mm layer height your print speed would be (10/0.4*0.25) = 100 mm / sec, at this speed the extruder will feed the material with 4.2 mm/sec.
[15:46] Bondtech : Try going even slower when doing the 100 mm test, but actually i do not recommend to use this as a calibration method, use this method instead, it will give you much better results: https://youtu.be/7ls3B97IHyg
[15:46] Customer : ok i’ll try thanks, i keep this words
[15:46] Bondtech : If you want really dimensional accurate prints this is the method to use, also it is needed to calibrate between different rolls of filament.
[15:49] Bondtech : The extruder is very precise manufactured, what can affect the extruded length is how deep the teeths cuts into the filament, it depends on the hardness of the filament and the setting of the thumbscrew. the more the teeth sink into the filament the theoretical circumference will decrease and the e-step needs to be higher, the less it cuts into the filament, the circumference increases and the e-step decreases.
But I would recommend to leave the setting at 415 (it has been verified by more than 20.000 users, use the flow setting or the extrusion factor setting in S3D to tune it.
[15:51] Customer : ok i’ll follow your advice
[15:56] Bondtech : You are welcome and happy printing! Let us know if you need any more help!