Cartesian Flying Extruder

A flying extruder makes a lot of sense on a delta, where it moves much less than the hotend (shorter distances and slower speeds) but it doesn’t seem like it would translate well to a cartesian printer.  I tried it anyways.  I didn’t like the artifacts I was getting from a long bowden drive or direct drive on my Eustathios, and in the process of shortening the bowden tube, I ended up with a cartesian version of a flying extruder setup.

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PETG Warping

I’ve had some issues with warping when printing with eSun PETG, which was surprising since I’ve never noticed any warping with PET before that.  Since many people seem to be getting warp free prints with eSun PETG, I assumed it might be caused by PETG from the early production runs.  So I purchased a new spool, and it does look quite a bit different (rougher texture to the filament).  For a test object, I used a fin on my ski pulk as that was one of the prints I was having troubles with.  The original was printed as a vase print, with a 1.5mm extrusion width.  The retest was done at a 1/3rd scale, also as a vase print.

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Using Firmware Retraction with Simplify3D

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Why use firmware retraction?  It lets you set configure retract and unretract speeds separately, and values can be adjusted mid-print.  (Too much stringing? try increasing retraction distance.  Nozzle marring previous layers? try increasing z-hop, Getting post-retraction bumps? try slowing the unretract speed or tweaking the restart distance).  Simplify3D doesn’t provide native support firmware retraction (as of January 2016), but it does have the ability to do simple gcode post processing.  This post describes how to use it to tune retraction speeds or enable firmware retraction.  Even if your printer’s firmware doesn’t support firmware retraction, you can still customize the unretraction speed.

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Walter’s Filament Collection – PLA

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For all the people who have asked about filaments, here's my list, spread across 8 different posts.  This list includes over a hundred filaments, with pictures, measurements, and impressions.  All are 1.75mm. Please don't read too much into my opinions, there's a lot of variation in filament and printers, and my opinions apply only to the spools I have on hand.  I try to be objective with these opinions, but my preferences and biases affect my opinion, so keep that in mind when browsing this list. Also be aware of the date, some of these filaments may no longer be available, or may be different from what is currently available.  I sometimes describe how I use and print some filaments just to provide another data point, it's likely that your optimal setup will be different from mine. 


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