I'm thinking TFT or bowden. Talk about feeder in a minute.
40mm/sec at 210 with .16 layers is definitely at the absolute limit I like to print at. It should be able to do about double this but still. This requires about 2kg of force. The feeder should be able to do 5kg. Either the feeder is the problem or something in between is adding a few kg of resistance.
TFT/head resistance:
Do a cold pull, then remove the nozzle and let it cool to below 40F. Pull the filament out and once cool insert some filament up from below. Feel how much resistance there is in the head.
bowden resistance. These get scratched up and the resistance can get pretty high. I'm not sure how to test this though.
feeder
Really the best test for this is to do a weight test. Tell it to extrude slowly with varying weights. It should be able to do about 10 pounds or 5kg. Here's my setup. With a scale underneath and with bungee, I can have the extruder lift more and more weight until it grinds or slips.
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phantom 17
Hi gr5,
Hahaha frustrating enough to oil them ????
1) I printed down to a 40mm/s with 210 to 215 degrees at 0.16mm
2) not confused about the wall thickness which is always at 0.8mm with 4mm nozzle
3)got a tft isolator matched for the waver spacer and normally never print hotter then 210 with PLA and currently have not used another material for the last year.
4)tried a new spool and unrolled quit a bit so it has 0 resistance.
5) unrolled filament from new spool so should not make a difference.
6)a/b/c knew about this and adjusted all to see if there was any difference
7)changed nozzle to new race nozzle already.
8 ) tried it and seems to be about right temp, although it's not really a good scientific approach off course.
9) had the feeder removed, cleaned, adjusted and spring tension adjusting while printing.
10)It can also still push a good deal of force. When trying harder types of PLA it skips when I try to do the feed with the dial manually and the nozzle is not hot enough.
With the somewhat softer PLA colorfabb has its doing the underextrusion for sure which makes me believe the feeder might be the culprit !
11)filament is the right diameter. Colorfabb measures in between 2.79-2.83mm and my Matteforge is around 2.72-2.76mm and machine is adjusted accordingly.
12) no issues here with temperature as it is 23 till 25 degrees
13) bowden is still the original and there is no feel of any resistance when I put some filament in by hand
14) switched nozzles and no difference.
15)never used CF
16) it's indeed on 1250 but checked with my finger on the feeder while printing and when it needs to feed it moves I think I will try thinker gnome this weekend.
If reading this back my best guess would be the feeder, what do you think and is there a cheaper way to check then just buy a new one, because then it would go for bondtechQR but that's a lot of money.
Thanks for your support gr5 much appreciated!
Greetz Barry
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