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Gear Print - Shrinkage causing taper  

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AutoDrone
(@autodrone)
Active Member
Gear Print - Shrinkage causing taper

Trying to print a gear for Powerwheels Gearbox out of PTEG material, however I keep getting this tapered affect through the first 2-3mm. (Brim material is seen still on the part here below, then you can see how the material tapers up to the left of the brim) of the print. Any suggestions for settings? Bed 95deg and Nozzle 240

Posted : 25/04/2022 2:32 pm
Chri81
(@chri81)
New Member
RE: Gear Print - Shrinkage causing taper

I had similar issues with a gear some months ago.

Try

  1. lowering the nozzle temperature and bed temperature
  2. avoiding air draft to the part shrings evenly
  3. using another material
  4. using the anti-elephant-foot setting in PrusaSlicer

BTW, I wouldn't use a brim for gears, way too much effort removing it; the contact surface should be sufficient enough.

 

Let me know if sth worked, for me it was a combination of temperature decrease (Nozzle -7°C, Bed -3°C) and closing all windows.

Posted : 28/04/2022 11:00 am
Robin
(@robin)
Noble Member
RE: Gear Print - Shrinkage causing taper

The brim looks a lot like a raft... Could you post your project file?

If at first you don't succeed, skydiving is not for you.
Find out why this is pinned in the general section!

Posted : 28/04/2022 2:18 pm
AutoDrone
(@autodrone)
Active Member
Topic starter answered:
RE: Gear Print - Shrinkage causing taper

 

Posted by: @chri81

I had similar issues with a gear some months ago.

Try

  1. lowering the nozzle temperature and bed temperature
  2. avoiding air draft to the part shrings evenly
  3. using another material
  4. using the anti-elephant-foot setting in PrusaSlicer

BTW, I wouldn't use a brim for gears, way too much effort removing it; the contact surface should be sufficient enough.

 

Let me know if sth worked, for me it was a combination of temperature decrease (Nozzle -7°C, Bed -3°C) and closing all windows.

Thanks for the info here, i have not tried this yet.

I have a boss extrusion about 1.5mm at the bottom of the Gear which I removed so the gear would profile would sit flush to the bed on my second print with success.

Even though this fixed the problem, it would be nice to have the boss (spacer) printed in the same part which I'm still pursuing. This is why you see the "raft" in Pursaslicer. I did still print with a brim the second time, but probably didn't have to.

 

Posted by: @robin

The brim looks a lot like a raft... Could you post your project file?

Still a noob trying to figure out best way to post my project file, probably Thangs.com right. 

Anyway this is the reason it looks like a raft, as i had supports from plate and brim turned on.

AutoDrone

Posted : 28/04/2022 2:55 pm
AutoDrone
(@autodrone)
Active Member
Topic starter answered:
RE:

Removed Boss from bottom of Gear so the gear would sit flat to the bed and reprinted with success (no taper profile on the gear face). I would assume the temperature is controlled better through the part by the bed vs. elevated by the boss and supported by the raft below causing the PTEG to cure to quickly and shrink the tips of the gear. The raft was acting like cooling fins and I would assume letting cool air under the gear profile. 

Thoughts? Is it possible still to print this with the boss at the bottom in one piece? 

Part with boss removed below. (current solution)

AutoDrone

 

This post was modified 3 years ago by AutoDrone
Posted : 28/04/2022 3:05 pm
Robin
(@robin)
Noble Member
RE:

Still a noob trying to figure out best way to post my project file, probably Thangs.com right. 

To get opinions/support on settings: Save in PrusaSlicer -> get a 3mf-file containing your model AND settings, ZIP it and attache to your post. Done.

If you want to publish/share a design: https://www.printables.com  

If at first you don't succeed, skydiving is not for you.
Find out why this is pinned in the general section!

Posted : 28/04/2022 3:17 pm
AutoDrone
(@autodrone)
Active Member
Topic starter answered:
RE: Gear Print - Shrinkage causing taper
Posted by: @robin

Still a noob trying to figure out best way to post my project file, probably Thangs.com right. 

To get opinions/support on settings: Save in PrusaSlicer -> get a 3mf-file containing your model AND settings, ZIP it and attache to your post. Done.

If you want to publish/share a design: https://www.printables.com  

Project File. 

PWH - First Gear v5

AutoDrone

Posted : 28/04/2022 4:48 pm
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