Printer not making holes with good dimensions

Please take a look at the simple attached file. When I print it, the dimensions of the cube are very precise BUT the dimensions of the hole dont. In this hole I was supposed to be able to insert a screw with 2.6 mm diameter. But after printing I cant insert the screw inside it, the hole is too smal (maybe 1.7mm).

I am printing with highest precision (0.1mm layer high, really low speed...). How can I improve this?

Change the hole size and print again.
Its a known issue that holes are always undersized

Thanks man, I thought there was a parameter to fix this. I changed the hole size a bit and it worked. Thanks a lot.!

can't remember where i found this, but it ios handy

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They suggested that where X mm was the required diameter of the hole then Y mm was the dimension needed to achieve it and that:
a) for vertical holes Y = 1.0155X + 0.2795 mm
b) for horizontal holes Y = 0.9927X + 0.3602 mm

These figures were for PLA, and as I understand it, they take into account various factors including the fact that the inside of the hole is unrestrained against shrinkage.

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Floyd
Change the hole size and print again.
Its a known issue that holes are always undersized

indeed...!

How come there is no internal program within the slicers to identify holes and then compensate for the shrinkage(which is I assume is the cause for this) during slicing?

Not sure honestly. My software at work for cnc lasers and plasmas compensates for inner holes if I want easy enough...

I expect shrinkage is not a standard number for all materials and all manufactured filaments. PLA, PLA+, PET, PETG, ABS, ABSPlus, Nylon would all have varying degrees of plastic shrinkage and I would assume you'd even see different shrinkage between PLA for example of different brands all based on what other "fillers" the plastic contains.

I've seen the Stratasys uPrint SE printers compensate for this, but those use their own custom slicer software and the machines are eprom locked to only use the Stratasys uPrint ABSPlus material cartridges.

True, we have a uPrint SE plus at work that I use and the spools are $205 per but they work flawlessly.