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November 9, 2016

Black is BAACCKKK…MG Chemicals

In my ever expanding quest to try out new filaments, I’ve always found that if you want to see how any filament performs, at the worst, just try out a roll of anything they make. In black. Seriously.

I’ve read that black filament is the toughest to print because of the dyes go into the production. Or magic. Yeah, one of those for sure.

Regardless of which of my delta printers I use, black has always been a bit of a duck shoot when it comes to getting good quality. Any other colour, no issues. Thus, must be magic. Yep.

As I sat staring at the two brand new unopened black spools of filament on my workbench I was undecided which I should try first.

The first was PLA, the new “improved” brand from MG Chemicals.

IMG 1911

The second, PETG. Truthfully PETG is my compromise to avoid printing with ABS (which gives me royal headaches) but it is so darn stringy and unpredictable that I haven’t printed with it much. Some would call that being a smart coward.

IMG 1912

Of course, I used common sense and did one at a time. And pigs can fly. Forget the common sense thing… I loaded up one of my deltas with PLA and the other with PETG. On the PLA I had to print out some tank treads for a robot I’m building so, 15 treads at a time. In black.

The treads are from Thingiverse Caterpillar Tracks. Although labeled as a work in progress, I’m doing it any way. Although I’d really like to build a fairly large Wall-E…maybe in time.

IMG 1903

My settings, 0.3 layer height, 50C bed covered in Elmers glue stick, 208C for the first layer, 200C after that. I’ve made 60 treads so far and they have come out absolutely perfect. No strings, no separation, just way better than I expected.

On the other printer, I decided to make something to hold my SD cards and flash drives. With PETG no less. Again, merely a design I found on Thingiverse called Moby_Stick

IMG 1910

My settings, 0.3 layer height, 50C bed covered in Elmers glue stick, 224C for the first layer, 222C after that. Used Slic3r’s built in support for the whale tail. Not the default supports but “rectilinear grid”, which I have found out is far better than the default support patterns.

On the whale the supports literally fell off when I chipped it off the heated bed. You got that right, I had to use a metal spatula to get it off the bed.

I’ve never had any issues with adhesion with Elmers and a 50C heated bed. I’ve read many a horror story from others about getting PLA or PETG to stick to the bed, heated or otherwise. With every solution from 70-100C heated bed to hair spray on painters tape, to Kapton tape. Me? Borosilicate glass, heated bed, 50C, Elmer’s stick.

Perhaps with a delta because the bed doesn’t move the glue stick approach works fine. But I’ve done the same with the standard Cartesian printer I had here and it stuck just as well. Thus the problem must lie elsewhere.

After the prints, I measured the diameter of the filaments. In hindsight it should have been done first but, well, in my excitement I kind of missed doing it. None the less, both the PLA and PETG measured out 1.75 on my micrometer.

Last year I used a number of different MG Chemical PLA filaments, which I will call “old stock” now. While colours like their gold or white were superb, some of the others, not so much. But this year, things are not the same old.

MG Chemicals has changed their products on Amazon. The new stock has cardboard sides and is labeled “Improved”. They aren’t kidding. I’ve noticed a few complaints about the size of the center hub not fitting some spool holders. Since I use spool rollers, spool center is a non-issue.

No idea what kitchen they are using to create this new improved brand of filaments they are selling, but so far in my tests, I’ve found that I don’t need my go to brands any more. I can grab a roll of MG, thread it up, and I know exactly what it is going to come out like.

When I add in the fact that MG is less expensive than what I usually buy, well, that’s just icing on my cake, sprinkles on my donut, gravy on my fries, well, you get the idea….:-)

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