Another clogged nozzle  

idler

How tight is your idler screw?

re: idler

It was fairly loose so I tightened to fairly tight but it didn’t make a difference. It still pulls in a few centimeters of filament after it stops extruding but it does eventually start to miss steps.

idler

Make the idler so it is flush with the external sides of the hole.  

Blocked nose!

I’ve also tried with various brands of PLA

May I ask which ones?

I ask because I'm involved in the running of a print farm (although this isn't using Prusa printers) and in the early days we had great problems with clogged nozzles, we tried several brands of filament before finally settling on ColorFabb Economy.  Now we usually get about 1,500 hours printing time per nozzle.

Re: blocked nose!

What’s with the insistence every reply requires a new title?

Nothing top-shelf. Some Inland PLA & PLA+ and GST3D PLA+ I got for $7/kg shipped. My Inland PETG prints just fine. Inland ran fine until the first time I had to rebuild the head. I feel like I’ve done something wrong but I don’t know what. 

Idler

That’s where it was at😕

Think I solved it

I disassembled the hot end while it was clogged and found the PLA had swollen inside the PTFE tube to the point that it was jammed. The nozzles I purchased have less threads so I have to thread the heat break in much deeper to make contact with the nozzle. This prevents me from making full contact with the heat sink and things must be getting too hot in there. Cold pulls or any pull really clears the jam and a fresh end of PLA slides in like butter until it swells in the PTFE tube once more. I suspected this was the problem once before but I must have compared the wrong nozzles. 

Posted by: @lusher00

I’ve gone through as many suggestions as I can find but haven’t found an answer for this. I get clogs when printing PLA at various points in various prints but I can run a load filament and it clears right up. I’ve tried temps from 205-225 but it makes no difference. I’ve also tried with various brands of PLA but still no joy. I’m using a .4mm nozzle and I have an upgraded titanium heat break so there is no diameter change within the hotend. I went back to the original heat break but that didn’t make a difference. I’m using a .20 layer height and I cranked the extrusion multiplier up to 1.1. I can’t print at 25% speed and I can’t print at 150% speed. The nozzle has no trouble maintaining the set point.

Idler

So you are saying it was the idler screw?

Re: idler

and battery bearings.

happy printing

Good to hear you have a solution- happy printing!