search

johnson-thomas / Creality-Ender7-Klipper-Starter-Pack

This repository holds the files/information required to get your crealty ender7 migrated to running wtih klipper.
20 stars 5 forks source link

Pressure advance on Ender-7 #1

Open ganzgustav22 opened 2 years ago

ganzgustav22 commented 2 years ago

Did you get it dialed in correctly? I tried printing the test cube and couldn't really see the cornes improving. It seems to be that the Ender-7 nozzle delays everything, if I set pressure Advance high enough to see a difference I get underextrusion right in the middle of the wall of the testcube, not near the cornes (as it is in different photos shown online).

johnson-thomas commented 2 years ago

I was able to get a decent performance after pressure advance tunning.

I did mine at 220C hot end temp and also have replaced my stock bowden tube and the coupler that connects the bowden tube to the bowden extruder.

i found the pneumatic connector that connects the bowden tube to the extruder to be not so firm causing the bowden tube also to move in and out considerably into the connector during retraction and subsequent extrusion.

have a check on your printer how bad this movement of the bowden tube is, and i recommend reducing the length of the bowden tube or may be something like a Capricorn/(any decent quality ptfe tube), with just enough length that it can reach the farthest corners of the printer and replace the pneumatic coupler on the Bowden extruder from the stock one.

The stock one had too much play for me and i used an older one i had thay seemed a bit better , still not perfect.

What was the hotend temperature you used, i usually have it at or above 220 when i print fast

On Fri, Apr 8, 2022, 2:27 PM ganzgustav22 @.***> wrote:

Did you get it dialed in correctly? I tried printing the test cube and couldn't really see the cornes improving. It seems to be that the Ender-7 nozzle delays everything, if I set pressure Advance high enough to see a difference I get underextrusion right in the middle of the wall of the testcube, not near the cornes (as it is in different photos shown online).

— Reply to this email directly, view it on GitHub https://github.com/johnson-thomas/Creality-Ender7-Klipper-Starter-Pack/issues/1, or unsubscribe https://github.com/notifications/unsubscribe-auth/AKHOILEZ24M7QLQ6UQC6JVTVEAQ4LANCNFSM5S4M6JPQ . You are receiving this because you are subscribed to this thread.Message ID: @.*** com>

ganzgustav22 commented 2 years ago

Thanks for your reply. I used PETG with 245 degrees which seems to be worse in that regard, atleast I needed lower values with PLA.

Have done more testing in the meantime and concluded that the hotend and/or the bowden setup are not good. It's really extremely "oozy" and it can barely push 20mm³/s through the nozzle. Which is probably the reason that Creality chose to set the infill flow rate for the infill (the only thing that is actually printed with 250mm/s) to 125% in their default Creality Slicer profile.

So I figured the printer needs higher filament throughput and a direct extruder with a tried and tested hotend. So replaced everything with a Mellow NF Sunrise Extruder with a V6 heatblock and Bondtech CHT 0.4mm Nozzle. And what can I say, it's like a totally different printer now, retraction only 0.7mm instead of 9mm before, Pressure Advance 0.04 with PLA and 0.06 with PETG. Parts are perfectly clean now and I can print at 250mm/s (everything, not just infill, also perimeters etc.) with 0.25mm layer height and 0.45 width with 100% fillrate. Before, anything above about 15mm³/s extrusion rate would get unreliable and ugly.