Bambu A1 inaccurate holes

[Andres26tnt]

Hi guys I'm having an issue with my Bambu A1. I'm using fusion360 to design custom trays, but my prints come out with smaller diameter holes, I've checked the design to make sure it's not me that is making the mistakes. It's definitely the printer or material (PLA). They come out .4 to 5 undersized. Not huge but enough to make my sockets not fit.

What have y'all done to fix this? I'm assuming it's maybe pla Shrinkage, from what I've read it's a 5% on PLA. I know there is a setting I can change to make them slightly larger in the printer don't remember unfortunately. I can always resize the holes by 2-3 millimeters, but that's annoying and time consuming.

Excuse my ugly work , this is just a test piece. Final design will look similar but different.

 

[BrandonV]

This is the setting you were talking about.

XY Hole/Contour compensation

wiki.bambulab.com

 

[niget2002]

It's shrinkage. Increase your part size 5% in the slicer to make up for it. Measure your x and y dimensions and see if they're off by a similar amount.

 

[Andres26tnt]

Thanks guys, I figured it was that. Looked at other interesting vid on holes for like 1h . Didn't know how many have this issue, learned a lot.

 

[ZX3ST]

I wouldn't just do a blanket 5% upsize, that's a LOT. Maybe more like 0.5% (probably even less for PLA, 0.1-0.2%) to account for shrinkage.

X/Y hole compensation if your part dimensions are otherwise correct.

I'd also visit the possibility that you're slightly over-extruding, and your model is otherwise fine.

Are you building in a little bit of relief from the get-go in your model? I've found that oversizing the holes 0.5mm and putting a 1.6mm fillet on the top surface makes putting everything away very comfortable.

I built all my socket storage using Bambu PLA and printed with an X1 Carbon. No hole compensation was needed.

 

[no704]

How much clearance did u put in your design?

 

[Andres26tnt]

How much clearance did u put in your design?

.5 on all of them. But I'm probably having multiple issues like y'all mentioned. Need to account for shrinkage and use a fillet for better fitment. Also the printer settings could be wrong. I'm a beginner, so I could be making mistakes. The bigger holes came out great, the smaller ones either .3 to 5 undersized from my original dimensions. I'm also using generic PLA so can't really rely on a set % of shrinkage. So measuring and applying/test pieces it is .

 

[Andres26tnt]

I wouldn't just do a blanket 5% upsize, that's a LOT. Maybe more like 0.5% (probably even less for PLA, 0.1-0.2%) to account for shrinkage.

X/Y hole compensation if your part dimensions are otherwise correct.

I'd also visit the possibility that you're slightly over-extruding, and your model is otherwise fine.

Are you building in a little bit of relief from the get-go in your model? I've found that oversizing the holes 0.5mm and putting a 1.6mm fillet on the top surface makes putting everything away very comfortable.

I built all my socket storage using Bambu PLA and printed with an X1 Carbon. No hole compensation was needed.

That what I meant, a .5% shrinkage is happening as it's consistent with my measurements after printing. So I'm compensating by an up size somewhere in that region and changing the X/Y. Gotta print a test piece just to make sure. Not looking for a tight fit, just good enough to hold the sockets in place. This box can't be flipped anyway so not to worried about sockets flying out