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Steven Marshall
(@steven-marshall)
Membre
Scale Factor Issues

I have a model that is a 3 inch cylinder with 4 modifiers. I used the scale factor to increase the size by 1% and now I get this:

When I try to re-scale it only scales the x-axis. 

This has also occurred in a number of saved copies of the model that I created over the past few days.

Anyone know how to fix this or how to prevent it happening again?

TIA

Publié : 24/07/2025 8:45 am
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Scale Factor Issues

Looking at the  world coordinates in the images above, I Don't see which value you have increased by 1%

It looks like the X, Y and Z values have already been scaled by different values.

Could you please zip compress the project file containing the 3 inch cylinder version of the model, and post the Zip file, for us to try and help with. 
regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK

Publié : 24/07/2025 9:24 am
Steven Marshall
(@steven-marshall)
Membre
Topic starter answered:
RE: Scale Factor Issues

Mirror New 3Inch PLA

Thanks. Project should be in the attached Zip file.

Publié : 24/07/2025 9:55 am
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Scale Factor Issues

Good morning Steven, 

You appear to have a cylindrical model, 82mm diameter with 13mm thickness

your first modifier appears to be a 230mm cylinder with it's axis 90degrees to the model axis, which you use to cut a curve into the top surface of your model

your second modifier appears to be a 74mm cylinder 2mm thickness, placed coaxial to the original model and level with the bottom of the model, to cut a recess into the centre of the bottom of the model

your third modifier appears to be a cylinder 76mm diameter and 1mm thick, located on top of your second modifier, to cause an enlargement of the void above your second modifier

and your  fourth modifier appears to be a slab. 27.27mm by 90.9mm by 2.02mm intersecting with your model at right angles to your first modifier, to cause a slot on each side of the curved cut out on the main model, approximately 7mm above the bottom of  the main model. 

3 inches is approximately 76.2mm 
you say you would like to increase  the 3 inch cylinder by 1%
does that mean you would like to increase your third modifier by 1%? 
and do you want to increase it by 1% on all three axis, or just the X and Y axis?

or have I Misunderstood your intentions

regards Joan 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK

Publié : 24/07/2025 10:49 am
Steven Marshall
(@steven-marshall)
Membre
Topic starter answered:
RE: Scale Factor Issues

Apologies, I was expecting the scale factor to reset to 100% after resizing an object but this doesn't appear to work if you have either a single part on the plate or all of the parts on the plate selected.

When I have multiple parts on the plate and I resize one of them by size it reverts the scale factor to 100% and I was expecting this to happen for every scenario so that I could make small changes to the size of the modified cylinder.

Publié : 24/07/2025 1:14 pm
BaconFase
(@baconfase)
Reputable Member
RE: Scale Factor Issues

Those scaling numbers have always been a bit wonky. You can scale individual parts of an object; you can scale multiple parts of an object at the same time; you can scale an entire object; you can scale multiple objects. And you can mix and match all those different scaling procedures multiple times. That scaling text box may or may not be accurately reflected depending on what combination of things you have selected at any instant. Which is why I don't use the slicer scaling for anything past a basic one step scale operation. If you need the precision, accuracy, multi-step scaling, then it's best done in a CAD program. Leave the slicer to slice up the final result.

 

In your case specifically, every time you scale an individual part (the modifier shapes or the actual cylinder), the scale will always show as 100% regardless of how many times you've scaled it up or down. That's how bad the slicer is with the scaling number.

You should create all the shapes in CAD, import them into PS as a single object, and then right-click>"change type" specific parts to change a printable 'part' into a 'modifier shape' if that's what you're trying to accomplish.

If for whatever reason you just don't want to or can't CAD, then at the very least do the multiple operations on a 'test shape' to arrive at final dimentions and coords to copy/paste onto a 'final/real shape'. Don't rely on the scaling number.

XL-5T, MK3S MMU3 || Printing with multiple nozzle-sizes: Official Guide, Unofficial(old) || PrusaSlicer Fork || Other advanced slicer tactics || TPU || HF Nozzles

Publié : 24/07/2025 10:06 pm
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