very poor quality on base radius

[PeterB]

Hi All

We are having trouble getting good quality base radii. We have tried changing outer base layer to 30mm/s for 60mm/s. We have tried with platform, with different z offset, without platform, changing bed temperature. We have trialled hollow and solid models and still get the same result. We have recalibrated the bed various times. We have dried the material the PLA. the wall thickness we are printing are approx 2-3 mm

Any help much appreciated..

[Vicky@Raise3D]

What type of machine you have?
The main reasons for defects such as these are temperature and cooling. If the material is being printed too hot or the enclousure of the machine is too warm you can see these defects.

[PeterB]

We are printing 205 degree for Raise PLA with the lid off in an unheated room. Machine is Raise pro 2

[Vicky@Raise3D]

You can try lowering the bed temp down to 50 and the nozzle temp down to 200. This will make the parts not stick to the bed quite as well but as long as the Z offset is properly set it should be okay. Please also prop open the side and front door to ensure that no heat will build up in the machine and cause these defects.

[DeX]

You should try to print with a thicker extrusion width. Like 0.45 for 0.4 nozzle

[PeterB]

thank you - we will try

[PeterB]

We tried a combination of Vicky and Dex's response:

200deegree C
50- degree bed
.45 extrusion width

Better results, but still not great.

[zemlin]

You're not going to achieve clean overhang of much over 60 degrees without using support. There's just nothing for the filament to sit on. Gravity sucks.

[Vicky@Raise3D]

Please make sure that both of the side cooling fans are working properly when turned on.
And if you can provide your Gcode file with us, that will be great!