Keeping print direction consistent
 
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Rob Meades
(@rob-meades)
Estimable Member
Keeping print direction consistent

Hi there. I am printing a circular belt, vertically, in PLA for use in a music box.  Everything works fine except that, on one layer, a layer that has more holes in it than any of the others, Prusa Slicer decides to change the direction of the print and this leads to issues, see images below.

Is there a setting I can tweak in my Prusa Slicer configuration to stop the print changing direction in this way?  FYI, I've tried halving the print speed (manually on the MK4S printer) but the fault still occurs.

 Belt Belt on build plate

Fault area Fault area

Best Answer by jan.d.slay:

Try not to exceed 50 mm/s for all layers (except the first layer).

You can also set the fan speed to 100% so that the single line loses temperature quite quickly.

Posted : 09/02/2026 12:14 pm
Rob Meades
(@rob-meades)
Estimable Member
Topic starter answered:
RE: Keeping print direction consistent

To clarify, here is a view in Prusa Slicer with "show travel" on: it is the criss-crossings in blue that I would like to avoid, I want just the nice [hidden 'cos they are inside the material] unidirectional circular movements.

Show travel Show travel

Posted : 09/02/2026 12:50 pm
jan.d.slay
(@jan-d-slay)
Reputable Member
RE: Keeping print direction consistent

Could I take a look at the 3MF in my Prusa Slicer?

Quick start printing for Prusa XL and Prusa Core One
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Posted : 09/02/2026 12:53 pm
Rob Meades
(@rob-meades)
Estimable Member
Topic starter answered:
RE:

Certainly: see attached.

This post was modified 3 weeks ago 2 times by Rob Meades
Posted : 09/02/2026 12:57 pm
jan.d.slay
(@jan-d-slay)
Reputable Member
RE: Keeping print direction consistent

Try not to exceed 50 mm/s for all layers (except the first layer).

You can also set the fan speed to 100% so that the single line loses temperature quite quickly.

Quick start printing for Prusa XL and Prusa Core One
Comfortable display working height on the Prusa Core One
Reducing metallic resonance noises on the Prusa Core One

Posted : 09/02/2026 1:20 pm
1 people liked
Rob Meades
(@rob-meades)
Estimable Member
Topic starter answered:
RE: Keeping print direction consistent

OK, giving that a try...

Posted : 09/02/2026 1:32 pm
1 people liked
Rob Meades
(@rob-meades)
Estimable Member
Topic starter answered:
RE:

That has definitely improved things, just a few spots left now.  Is there a speed/fan setting I missed (see below) or should I just try an even lower print speed?  It is not a large print so slower is not a problem.

 

New speeds New speeds

Fan control Fan control

Remaining faults Remaining faults

This post was modified 3 weeks ago by Rob Meades
Posted : 09/02/2026 3:20 pm
1 people liked
Rob Meades
(@rob-meades)
Estimable Member
Topic starter answered:
RE: Keeping print direction consistent

Ah, no, I had the fan on 100% of the time, rather than at 100% power: switching to fan at 100% power did indeed do the trick.

Many thanks for your swift and valuable help!

Posted : 09/02/2026 8:03 pm
2 people liked
jan.d.slay
(@jan-d-slay)
Reputable Member
RE: Keeping print direction consistent

 

Posted by: @rob-meades

Ah, no, I had the fan on 100% of the time, rather than at 100% power: switching to fan at 100% power did indeed do the trick.

Many thanks for your swift and valuable help!

You're welcome. I'm glad it was a simple mistake that we were able to fix without much trial and error!

Since it was only a single perimeter, it must rest stably on the lowest line. It cannot be supported on either the left or right. Therefore, it requires as much cooling as possible to maintain its position.

Keep up the good work!

Quick start printing for Prusa XL and Prusa Core One
Comfortable display working height on the Prusa Core One
Reducing metallic resonance noises on the Prusa Core One

Posted : 10/02/2026 6:31 am
1 people liked
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