Front and Back cooling for printed parts
I finished my MK3s kit about a week ago and the only flaw I have found is the print cooling.
The current configuration does wonderful for the "front" of the print but seems to lack for cooling the "back" of the print. I have found that thin parts can do fine if rotated to be perpendicular to the cooling duct and seem to be fine but a thicker part has the backside of the part "droop" when printing overhangs.
Have others had this issue and/or have people found a solution to this issue? I was thinking of working on a wrap-around part cooler to address this issue but I don't want to reinvent the wheel if the issue has been addressed already.
RE: Front and Back cooling for printed parts
Check your fan alignment. You can have it oriented to blow more air on the heater block than nozzle area. There are a few alternate fan designs available that you can try. I never found a huge difference on my Mk3, but slight improvements. Check on PrusaPrinters and Thingiverse.
RE: Front and Back cooling for printed parts
Thanks for the reply!
Looking at the Mk3s 3d model it looks like it should but I'll double check. If the problem continues I'll try one of the modded fan shrouds to see if that helps then.
RE: Front and Back cooling for printed parts
Looking at the Mk3s 3d model it looks like it should but I'll double check. If the problem continues I'll try one of the modded fan shrouds to see if that helps then.
I found there's a little wiggle room with the fan on my Mk3. If I loosen the screw, I can reposition it a few degrees. I make a point of pressing the fan shroud snugly against the fan outlet before tightening. I haven't upgraded to the Mk3s configuration, so I'm not sure how different that is.
RE: Front and Back cooling for printed parts
Looking at the 3D model for the Mk3, it actually looks like the Mk3 has a better cooling duct. I'll try to see if I can tilt the duct down and get better results.
RE: Front and Back cooling for printed parts
On my MK3 I printed and used a design by RH_Dreambox because of the air flow simulations that he did. It worked well for me, but I never did any print comparisons to the stock MK3 part cooling shroud. He has released an updated version with the MK3S mounting, I haven't gotten around to printing it for my MK3S yet, but it has to be better getting air flow coverage towards the back of the nozzle than the stock MK3S shroud.
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs