I’ve loaded a part I designed in Tinkercad. This item is 20mm across. When I load it into Bambu Studio, it shows exactly that, 20mm diameter. Then it prints out with a diameter of 25mm. I’ve tried re-saving the stl and reloading into a fresh instance of studio 3 times. It’s always wrong. Any ideas w…

How are you measuring the print? If you using a caliper, double check that it is zero’d correctly as this has been the root cause for several others that had “part too big” issues.

Can you upload the .3mf file you’re using with the stl from Tinkercad?

Please check your Horizontal Expansion / XY Contour Compensation setting. [image] Compensation x y z Bambu Lab Software greeting how to properly calibrate the printer. If it is printed with PLA and I print X 100mm and Y 100mm with a height of 50mm there is a…

The system doesn’t seem to allow it “Sorry, the file you are trying to upload is not authorized (authorized extensions: jpg, jpeg, png, gif, heic, heif, webp, avif, 3mf).”

You need to upload the .3mf file. Ie the file that Bambu Studio saves that you imported your STL into.

Thanks for your help Jon :slight_smile:

The caliper is zeroed properly. The item is sized to fit into an object that is 17mm in diameter. The part that prints improperly is designed to slip over it. The problem is that when I print this part, it’s clearly too large. That’s the rubber meeting the road - the part is too big, fo’ sho’

[image] user_1870728933: The problem is that when I print this part, it’s clearly too large. The object in Slicer definitely shows the correct dimensions: 10 mm half-diameter - so 20 mm in total. [Screenshot 2026-06-10 203456] However, I think I know what you mean - that stuff around your…

The model and settings seem ok in your .3mf, no big red flags. Do you have a pic of the print result, ideally with a real-world scale next to it? If you cant post it here, send it to imgur etc and link here. Maybe we can notice something else. Any other well-known tests show up as wierd too? Li…

Thanks for the tip retro. I pull the brim off of course. The base part is just too big

Bambu Studio Prints item too large

Bambu Lab Software Bambu Studio

user_1996984904 June 10, 2026, 6:42am 3

Please check your Horizontal Expansion / XY Contour Compensation setting.