I'm having a strange problem while calibrating my printer.

3D Printing
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1

I’m having a strange problem while calibrating my printer. I’m printing a square with a hole in it.

The square is 0.5mm over size while the hole is 0.5mm under size.

I’ve calibrated the E steps and the object doesnt look overfilled or squashed.

Any ideas?

2

I fully appreciate that but my old mendel i2 is much better than +/- 0.5mm.

I’m using a 0.35mm J-head. I’ve tried slic3r and Cura with exactly the same results.

Using slic3r i tried to change the perimeter extrusion width and I couldn’t get the dimensions accurate without losing quality.

I am assuming that this is a hardware issue?

3

Can you start printing the hole OD and then complete the square perimeter last?

4

@Temujin_Kuechle I don’t really see how that would help. its 0.5mm out using a 0.35mm nozzle.

What are you thinking?

5

I’d say youve a miss match in your software regarding extrusion to wall thickness

6

@Nigel_Dickinson Do you mean the perimeter extrusion thickness in the slicing software?

7

I meant that sometimes there might be an advantage to building from the hole outwards if the hole is critical. However, it’s just an out of the box idea, a suggestion to try for a different result. It might just be a software issue related to wiggle or extruded diameter. I use an SLA printer in my workflow and its also not that exact, as it can be .03mm off on the x and y axis. Normally, I offset my parts .05 for fit.

8

@Daniel_Wood yes is it a multiple of the nozzle size. So 0.35,0.7 etc for your wall thickness