2 mm hole gets printed all solid

[klaus_kraemer 3]

I have built an adapter to mount on a syringe. Its hole width at the top should be 2mm in diameter.

 

CURA shows the hole and the dimensions seem to fit:

 

When this adapter is printed with a 0.8mm AA nozzle, the hole in the tip simply does not exist! The adapter is air- und watertight! I have experienced that they always tend to be too small -- but there is a real leap between 2mm and solid airtight

 

Is there a way to achieve exact inner hole diameters? 

[burtoogle 508]

Hello @klaus_kraemer, it would help a lot if you could attach the project file (do File->Save) to this thread. Thanks.

[klaus_kraemer 3]

Hadn't known the project file would help - here it is:

 

UM3_Ohrreinigungsduse - Ohrreinigungsduse.3mf

 

Thanks for trying to help!

[burtoogle 508]

Hi @klaus_kraemer, I sliced the top (narrow) part of your model and it printed very nicely using a 0.4mm nozzle and 0.5mm wide lines. Layer height was 0.1mm. I wonder if your print is suffering from overheating. You're actually printing very slowly (4mm/S) and maybe the nozzle is heating the model too much and so you are getting poor definition?

 

If you do try using a smaller nozzle and 0.5mm wide lines be sure to enable the overlap compensation and also set the Mininum Wall Flow quite high (I used 80%) as this will stop a lot of extra travel and tiny extrusions that would otherwise happen. Hope this helps.

 

[klaus_kraemer 3]

Thank you @smartavionics!

 

I'll try your suggestions tomorrow morning. In the meantime I had also switched to a 0.4 mm nozzle. The hole has 1.7mm diameter instead of 2.4mm (I had it slightly widened before trying the new print).

 

Best regards

Klaus

[klaus_kraemer 3]

So far: It's better now and you showed me a new approach!

 

Thank you!