I need a bigger hole

I'm printing with a Prusai3
with a nozzle diameter of 0.4 printing with a layer height 0.2 filament diameter 1.75.
Calibration is correct done this multiple times.

I'm printing new parts for new printers that I want to build, but the holes that I print are smaller than they should be.
I tried 3 slicer programma's (Slic3r, Kisslicer, Sfact) thinking that was maybe the problem, tried allot of different settings but couldn't figure out what the problem is.

the holes need to be 7.9 mm in diameter, but when i print them they become 7.2

If you need more information on settings just ask and i will give them.

Hopefully we could fix the problem.

Edited 2 time(s). Last edit at 09/02/2013 02:33PM by Kirschner3D.

A layer height larger than your hole might be causing some problems.
I would first try a layer height of 0.3 (or max 0.4) mm.
If you are using Skeinforge you might activate the Stretch plugin.

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

Thank you for the reaction,

i made a typo in the post the layer height was 0.2. i changed it now.
furthermore i tried stretch in skeinforge and mad absurd changes to see if it would make that much of a difference but i still wouldn't fit.

How are the external dimensions?
Are they also too small? ...or are they within 0.1mm of the proper size?

---

Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

ATM we are recalibrating the printer, just because we don't trust ourself anymore and starting from scratch.
i'll post a little bit later the results and see if this will change anything.

Might be worth reading the discussion here on Nophead's blog: [hydraraptor.blogspot.co.uk]

Alan

Yeah that is a good article from Nophead,

But it was a callibration issue the x and y axis where to short so that makes the hole to small as well.

we sliced it with every slice program we have(slic3r, Kisslicer, Sfact, Cura) and don;t see any problems anymore in hole shrinkages.

we like our holes now and practically everything we put in it fits.

Kirschner3D Wrote:
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> we like our holes now and practically everything
> we put in it fits.

Really? With ABS???
Please, print Nophead's cal.stl and show result