Notifications
Clear all

0.2 Nozzle extrusion problem  

  RSS
Winthorp
(@winthorp)
Eminent Member
0.2 Nozzle extrusion problem

Good day,

 

since I use the printer for small and detailed objects I decided to mount a 0.2mm nozzle on it (MK3S)

I use Prusa Slicer as slicer, I took the 0.25mm nozzle values and changed the size to 0.2mm

 

It works pretty well but SOMETIMES, not always, the extruder motor start to produce a clicking noise and the print underextrude.

If I simply pause the print, remove the filament and insert it again, the problem is solved.

 

I checked for clogs, changed nozzle, cleaned the feeder, checked the PTFE tube, all is perfectly clean.

 

My only theory is that there is something else to change in the slicer settings, but before starting with trials and error maybe someone more expert than me could have an idea.

Posted : 17/08/2019 8:56 pm
Chocki
(@chocki)
Prominent Member
RE: 0.2 Nozzle extrusion problem

I think you may have to slow down the feed rates, but I would also try increasing the temperature by 10 deg to make the filament softer so it will flow easier, there is a maximum volumetric flow calculation that you have to set the maximum volumetric flow to, this will in effect cap your speeds to prevent the extruder trying to force too much filament through the small orifice too fast and cause the extruder motor to click.

I'll try and find a post with it and reply.

Normal people believe that if it ain’t broke, don’t fix it. Engineers believe that if it ain’t broke, it doesn’t have enough features yet....
Posted : 17/08/2019 9:05 pm
Chocki
(@chocki)
Prominent Member
RE: 0.2 Nozzle extrusion problem

Ah here you go: http://projects.ttlexceeded.com/3dprinting_nozzle_sizes.html

Normal people believe that if it ain’t broke, don’t fix it. Engineers believe that if it ain’t broke, it doesn’t have enough features yet....
Posted : 17/08/2019 9:08 pm
--
 --
(@)
Illustrious Member
RE: 0.2 Nozzle extrusion problem

One trick is to set the panel of extrusion widths all to 0, so P.Slicer calculates the ideal extrusion widths automatically.  Also, set the flow limit to 1/4th the 0.4 mm level (actual value for 0.4 should be around 12 mm3/s, so a 0.2 nozzle will flow at something around 3 mm/s max.  This is a guestimate, but a good starting point. 

This post was modified 2 years ago 2 times by --
Posted : 17/08/2019 11:35 pm
Share: