First Layer Fine Tuning

First Layer Fine Tuning

Postby timrwilliams » Mon Mar 31, 2014 3:19 pm

I haven't fitted an extruder/hot end yet, but I have been trying out preprocessed gcode with a dummy hot end
used for obtaining bed zero values.
I can trim the first layer height by using a Z offset in slic3r. I can sort of trim it by editing gcode although I am not very experienced in this. Presumably 'segmentise.py' values can be shifted.
Does anyone have a best practice method for getting the first layer spot on.
Thanks for any advice
timrwilliams
 
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Re: First Layer Fine Tuning

Postby NeoTheFox » Mon Mar 31, 2014 3:37 pm

First of all you should make shure all of segmentizer points are on the same height, and they can be reached from home position with G1.
When you have your hot end travel over the bed with no Z wobble - you can safely trim offset in slic3r. It worked out for me.
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Re: First Layer Fine Tuning

Postby Nicholas Seward » Mon Mar 31, 2014 4:04 pm

Segmentize could be modified to have a z shift fairly easily. However, Slic3r seems like a pre-existing well tested solution.

I agree with Neo about checking for z wobble. (For the record, with printed spools you will have some unavoidable z wobble. I really need to get error correction tables for each arm and that should go away.)
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Re: First Layer Fine Tuning

Postby timrwilliams » Wed Apr 02, 2014 11:21 am

Thanks for all the advice, I think I am starting to get the hang of it!
I am going to concentrate on the extruder/hot end for a time.
I have printed the GUS extruder body which seems excellent.
I think the hot end will have to be to the J Head design.
From past experience keeping the PEEK body cool is important
I have done this actively with a fan and passively by adding copper clip-on fins. Both work well
timrwilliams
 
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