Notifications
Clear all

Bed fan speed when printing ABS  

  RSS
Carl A
(@carl-a)
Estimable Member
Bed fan speed when printing ABS

Don't print ABS much but just noticed that my bed cooling fan isn't spinning or spins slowly intermittentantly while printing ABS. Have not seen that happen when printing PLA or PETG. Prints OK. Any comments.

Posted : 18/08/2020 11:17 pm
jsw
 jsw
(@jsw)
Noble Member
RE: Bed fan speed when printing ABS

Do you mean your filament cooling fan, as in the larger one to the front of the extruder on the MK3S?

Posted : 19/08/2020 12:41 am
Carl A
(@carl-a)
Estimable Member
Topic starter answered:
RE: Bed fan speed when printing ABS

Yes, sorry about the wrong terminology. I thought it might be the way the PRUSA slicer writes the gcode. The prints are OK. 

Posted : 20/08/2020 5:03 pm
Neophyl
(@neophyl)
Famed Member
RE: Bed fan speed when printing ABS

Fan settings are under the filaments tab. Abs is usually set with minimal or no cooling as it warps massively. 

Posted : 20/08/2020 8:18 pm
jsw
 jsw
(@jsw)
Noble Member
RE: Bed fan speed when printing ABS

IIRC, my fan usually remains off for the first layer when printing ABS and may stay off for more.  I know it does start shortly after the beginning of the prints.

For ABS, I've found a few tricks which can really help when printing ABS without an enclosure.

I always make sure the printer is warmed up and stabilized before beginning an ABS print.  I'll preheat and let it sit maybe 10-15 minutes.  I'm beginning to get in the habit of doing this for all filaments and not just ABS.

Draft shield!  Under the skirt and brim section of PrusaSlicer.  This creates a mini-enclosure and I use it on all ABS prints except for the very smallest.

When an ABS print is finished, I always let it cool a bit before even removing the plate from the printer, and let it cool more or less to room temperature before removing the print.  The print comes off much easier and it's easy to deform a too-warm ABS print, particularly one with thin detail.

Posted : 20/08/2020 9:45 pm
Carl A
(@carl-a)
Estimable Member
Topic starter answered:
RE: Bed fan speed when printing ABS

I have a complete enclosure for my all my printing but close it and put the exhaust fan on low when printing ABS. I suspected that the fan speed was stopped or minimized because of the tendency of ABS to warp. like you, my bed is fully closed before I attempt to remove any ABS items (same for PLA and PETG).

Posted : 21/08/2020 12:47 am
Roberts_Clif
(@roberts_clif)
Eminent Member
RE: Bed fan speed when printing ABS

I have an enclosure that was made from a single sheet of plywood to enclose both my 3D Printers.

On the back center of the enclosure have added a bathroom exhaust fan to remove the smells that occur when filament is melting.

Controlled with a light dimmer to adjust fan speed and not cause any change in the internal temperature of the enclosure.

The enclosure, one on my best decisions allows for Printing ABS indoors odor free, also creates an almost warp free environment.

As of this date have not printed any PETG though was told the enclosure should as good if not better than the ABS.

 

Electronics Technician / Computer Programmer...
Posted : 19/11/2020 7:44 pm
Carl A
(@carl-a)
Estimable Member
Topic starter answered:
RE: Bed fan speed when printing ABS

I failed to mention that my variable speed exhaust fan has carbon filter to filter the exhaust air. I have not had a problem printing PETG or ABS using PRUSA Slicer. I was just curious about the print fan stopping during the print. I guess it is perfectly normal.

My enclosure is plexiglass and is clear on all sides except the back whicj has reflective surfaces (like a mirror) and I have 3 LED strip bars (one in back, one over the top and one in front at bed level. Have a Rasberry PI 4B with a camera that is yet to be installed.

Posted : 20/11/2020 3:45 am
Roberts_Clif
(@roberts_clif)
Eminent Member
RE: Bed fan speed when printing ABS

I thought about adding a of some kind carbon filter or Hepa filter before exhausting the air outside have not incorporated yet.

Need to get it together and throw myself into that first roll of PETG filament.

Thought about using something other the wood to build my enclosure, it seemed pointless I can only get to the front of the enclosure.

Adding the LED into the T-slot the 3D Printer was so dark in the enclosure could not use my Raspberry Pi Camera with OctoLapse.

This post was modified 1 year ago by Roberts_Clif
Electronics Technician / Computer Programmer...
Posted : 20/11/2020 1:10 pm
Carl A
(@carl-a)
Estimable Member
Topic starter answered:
RE: Bed fan speed when printing ABS

The plexiglass allows me to see from all angles. The mirror surface on the back wall lets me look at the back of the print, the LED strips (purchased at Lowes) give excellent lighting to all sides of the printer. I have feeder holes on the top and a roller rail that allows me to have 3 filament rolls installed at a time (each has its own feeder hole with a short tube to prevent abrasion as the filament feeds through the hole. 

Pics attached

Posted : 20/11/2020 3:22 pm
Carl A
(@carl-a)
Estimable Member
Topic starter answered:
RE: Bed fan speed when printing ABS

Seems that the site will not post the pics or at least I cannot see them. Hope you can.

Posted : 20/11/2020 3:29 pm
Neophyl
(@neophyl)
Famed Member
RE: Bed fan speed when printing ABS

Nope no pics. Use the add media button. 

Posted : 20/11/2020 4:34 pm
Carl A
(@carl-a)
Estimable Member
Topic starter answered:
RE: Bed fan speed when printing ABS

Printer enclosure 1

Posted : 20/11/2020 5:26 pm
Roberts_Clif
(@roberts_clif)
Eminent Member
RE: Bed fan speed when printing ABS

carl-a-2 I do not see any of the images.

Do I have a video posted

This is my First ABS Print Ever printed with Raspberry Pi > OctoPrint using OctoLapse to capture still frame video

Electronics Technician / Computer Programmer...
Posted : 20/11/2020 10:32 pm
Share: