printing cylinder on Mk4S  

RE: printing cylinder on Mk4S

How did you make the object?

I would be using Blender, where you can set how many sides the polygon will have.

RE: printing cylinder on Mk4S

I am using design spark mechanical and then Prusa slicer.

RE: printing cylinder on Mk4S

Check if your design software has settings for its export. If the output of your cad is only exporting lower resolution on curves then there isn’t really another practical option.  If it can’t output higher fidelity curve approximations (which would be unusual) then yeas changing your design software to something that can would be the way to go. 

RE: printing cylinder on Mk4S

Thank you very much. i will chech. However, in the meantime I used 123 to draw the cylinders and they came out OK after choosing the fine resolution for export.

Thank you again.

RE: printing cylinder on Mk4S

I made a quick search, and I found there is a g-code command to make a circle/arc G02&G03. Based on 2yrs old Reddit posts, the printers actually support this, but PrusaSlicer doesn't generate these codes. There suppose to be postprocessing script, which concerts arc-like moves to G3 (Arc welder).

Did anything change? Did anyone tried the script?

The Reddit thread: https://www.reddit.com/r/prusa3d/comments/143wvou/prusa_mk3_and_mk4_with_gcode_g02_and_g03_arc/

RE: printing cylinder on Mk4S

You are a little behind the times.  Prusa Slicer added the option for arc fitting awhile back.  Its a yellow/Advanced setting located in Print Settings>Advanced>Slicing>Arc Fitting.  You can turn it on and it will try and replace the straight segments with an Arc.

Unfortunately that wouldn't really help with the original posters issue as the base model being sliced would have been low poly.  

When sliced the slicer would normally have to break down a smooth arc into many short straight segments.  The G2/3 commands alleviate the need for that if the printer supports those.  But as I say with an original model that is already straight segments there's no arc to convert.

RE:

Posted by: @michel-6

I am using design spark mechanical and then Prusa slicer.

I'm unfamiliar with the DesignSpark software suite (I use FreeCAD for mechanical design), but I did find this in their DSMechanical FAQ:

https://www.rs-online.com/designspark/how-do-i-get-a-perfect-round-shape-for-my-3d-print

In their examples, even the finest (custom) export settings example I can still see some faceting in the model, but that might be fine enough to either be lost in the 3D print process and/or interpreted by PrusaSlicer's Arc Fitting algorithm as a curve to use G2/3 commands on.

RE: printing cylinder on Mk4S

Thank you all. Yes I finally found the fine setting resolution on design spark. Now my cylinders come out ok. Thanks again.

RE: printing cylinder on Mk4S

Thanks for the update, good to know. I'll certainly check those settings