Jump to content
Ultimaker Community of 3D Printing Experts
Oj00

UM3+UM3E Holes printing under-size

Recommended Posts

I have done a lot of research into this and it seems to be caused by many factors and there isn't really an answer how to fix this.

What I have done to minimize this is print a test piece of varying diameters (10mm-100mm for me). Then i measure the actual and compare it to the virtual size. This gives me a good idea of what size a hole will come out as and I adjust the model before printing.

Share this post


Link to post
Share on other sites

All technologies including FDM and injection molding have weirdnesses like this (e.g. in injection molding if you want 90 degrees corners your cad part better not have 90 degree corners).

I add typically .4mm DIAMETER (not radius) to all vertical holes.

The cause of all this is that the filament sticks to itself while cooling and shrinking in a fraction of a second as it comes out of the nozzle and it's like sticky mucus (like snot). It's pulling like a liquid rubber band and pulling inward on these vertical holes.

Horizontal holes don't need to be adjusted in diameter (but you might want to put pointy tops to the holes).

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

[[Template core/front/global/_customFooter does not exist. This theme may be out of date. Run the support tool in the AdminCP to restore the default theme.]]
×

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!