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Altruego
(@altruego)
Trusted Member
Weird scaling issue

I purchased a used MINI+ that seems to be in good shape.  Only 72 hours on the print clock.

 The weird issue is the prints are 176% of what the model size is.  I've updated the firmware and am using Prusa 2.7.2 for slicing.

Hope this isn't a stupid question but it has me stumped.

 

Posted : 22/01/2024 12:33 am
fuchsr
(@fuchsr)
Famed Member
RE: Weird scaling issue

You're saying you're importing a model designed at say 100mm length and it's 176mm in Prusaslicer? What software are you're exporting from? Usually, mis-scaling is a mm to inch conversion issue but that's not 176%. You may also want to upload a Prusaslicer 3mf file as well as your source STL, in a zip file, so we can take a look.

Posted : 22/01/2024 12:49 am
Altruego
(@altruego)
Trusted Member
Topic starter answered:
RE:

The model was made in openSCAD.  And it prints perfectly on my MK4 and MK3S+.    IT's only the MINI+ that is printing too large.

Here is the .3mf file.  The STL is embedded in that.

 

This post was modified 4 months ago 2 times by Altruego
Posted : 22/01/2024 1:20 am
Altruego
(@altruego)
Trusted Member
Topic starter answered:
RE: Weird scaling issue

I found the problem and it was with me.  I had grabbed the hook.stl from the wrong directory.  The one I grabbed is a large one.  Oof!

Posted : 22/01/2024 2:08 am
Bandit Designs
(@bandit-designs)
Member
RE: Weird scaling issue

I've had a somewhat different problem, yet the same thing..... I download a file from printables and it prints perfectly. I can add to the file and still prints fine, however if i use scale and scale the print up a bit to make it larger it will not print properly. it wont really print at all, its just a big mess. Im not sure if its due to a glitch in the slicer (2.7.2) or something im doing wrong  Newbe with 3D printing, 8 years with my CNC Router

Posted : 06/03/2024 12:34 am
Thejiral
(@thejiral)
Noble Member
RE: Weird scaling issue

Does the file contain meshing errors (Prusa Slicer shows the number of meshing errors and also a warning triangle in case of errors)? This can cause all kinds of not necessarily reproducible issues. 

I would run, "repair with netfabb" in the slicer on the object first. Never hurts. 

Scaling shouldn't mess up your print, only screw up the tolerances by the very nature of scaling. 

You'd have to upload your zipped 3mf file of the object (best before and after scaling) if you want someone else to have a look at the actual cause. 

Mk3s MMU2s, Voron 0.1, Voron 2.4

Posted : 06/03/2024 8:10 am
Diem
 Diem
(@diem)
Illustrious Member

if i use scale and scale the print up a bit to make it larger it will not print properly.

Sometimes a sophisticated design is optimised for a particular size of nozzle or number of layers/perimeters.  In this case a small enlargement night break the optimisation 'though the problem is commoner with size reductions ...

Usually a designer capable of this precision will put a note in the documentation so that's the first place to check.

The next is the slice preview in PS.  Look at the structure at design scale and then slice the enlarged version and look again - do you, for example, have gaps, too small to fill with filament, appearing between structural extrusions?

If you're still uncertain show us the files as requested above.

Cheerio,

Posted : 06/03/2024 10:16 am
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