BMG vs clone test

A Former User

And without China, where would we find all these beautiful viruses?

I'm sure africa has more than ebola to offer, as will any place where humans can contact new species of small and large living things.

DocTrucker

Taken to extremes the majority of components on Duet boards are likely sourced from east asia. Likewise I think many of our favoured companies sub contract manufacturing or source sub components from similar locations. Large 'capitalist' companies have basically built the 'communist' east asian manufacturing power house.

deckingman

@jens55 said in BMG vs clone test:

While I agree with this sentiment in some respects, it fails to see the total picture. Like it or not, a very large percentage of products or part of products are manufactured in China (or other low cost manufacturing countries). You can't simply pretend that China is not part of the global manufacturing system.
It would be nice if you could but you'd see every product go up in price by a factor of ten or more and nobody could afford to buy anything. If we would simply say "let's not buy anything from China" then our way of life would pretty much grind to a halt .... and that's assuming we had the manufacturing capacity which we don't have.

You do have the manufacturing capability - you could have bought a locally made Dyze extruder.

This is probably not the time or place for this discussion but I think the way of life as we know it may now be relatively short lived. For sure, 30% of everything worldwide is manufactured in China (including Duet boards unless I am mistaken). China also owns the majority of the of the worlds shipping and much of the worlds infra structure which moves those goods around the planet. Then if you look at what China is doing to it's own people, the recent events in Hong Kong, their activities in the South China Sea, the territorial disputes they current have with Russia, India, Kazakhstan, Kyrgyzstan, Mongolia, Laos, Philippines, Malaysia Indonesia, South Korea, North Korea etc, something has to give. Then there are the swingeing economic sanctions that they have imposed on Australia for daring to ask for an independent enquiry into the origins of Covid. The western world is starting to wake up and smell the coffee but it may already be too late. After Hong Kong, Taiwan will be next on their list. Will the rest of the world stand by and let that happen? If so then what? The entire South China Sea area? The Philippines? Malaysia? Sooner or later, something will give and then we really are stuffed.

deckingman

@DocTrucker said in BMG vs clone test:

Taken to extremes the majority of components on Duet boards are likely sourced from east asia. Likewise I think many of our favoured companies sub contract manufacturing or source sub components from similar locations. Large 'capitalist' companies have basically built the 'communist' east asian manufacturing power house.

East Asia is fine. Nothing wrong with South Korea, Japan, Vietnam, Malaysia etc....

DocTrucker

I'm sticking with my east asian comment as although the whole area isn't the problem, it is also not only China that's the issue that leads to UK/US/European manufacturing appearing extortionate. It's a problem borne from race to the bottom economics and requires governance that isn't afraid to do things that shareholder led businesses won't do by their own accord. Use money from import tarrifs to help comparative internal industries compete at near the same point.

zapta

Like most markets, the extruder market also has room for a spectrum of quality and price points.

For example, one of the most popular printers in the market, the Ender 3, costs about the same as a Duet 3 board, and still makes many makers happy,

DocTrucker

@zapta spot on. Measured on does it get me to work, and over to my friends house in the evening a Bentley looks fairly crap compared to a Skoda.

Clones and copies are always going to be a contentious issue, but without the threat of clones and with no one copying each other to the slightest degree there would be far greater likelihood of profiteering which would make aspects of this pursuit/hobby/technology impractical.

Yes the BMG clones appear a direct copy of the bondtech units but in reality they are not. Different manufacturing methods and materials have been chosen that have allowed a significant per-unit cost saving in both production time, and improved production rate at the cost of flexibility. Along with reductions in quality control and customer support. Pay your money, take your choice. The fundamental innovation in the Bondtech BMG may have been new to 3D printing, but it was already in use for welding. So should they really be granted immunity from being copied just on the basis they borrowed a MIG wire feed mechanism and applied it to FFF machines?

If the real grumble here is the fact that some of the east asian countries can make things far cheaper than UK/US/EU countries or there is a particular grievance with a specific country then that is either the commentator having an issue with their governments import tarrifs/regulations, or indeed a political opinion on the country of source. While I may have strong feelings on both aspects I don't think this forum is the place to discuss these issues.

A Former User

@DocTrucker said in BMG vs clone test:

So should they really be granted immunity from being copied just on the basis they borrowed a MIG wire feed mechanism and applied it to FFF machines?

sadly some patents are approved for using a non-novel concept in a pseudo-novel context, however not all hold up if challenged after the fact (admittedly i don't know, or care, if Bondtech has a patent)

DocTrucker

@bearer yes some patents that I have seen granted are laughable. Traxas for example have been very actively patent hungry in the area of radio control model cars patenting things like using two servos instead of one for steering. Necessary evil but also not really fit for purpose.

zapta

Does Bondtech AB have patents related to their extruders? I couldn't find any, not in search nor on their web site.

https://patents.google.com/patent/EP3659783A1/en?assignee="Bondtech+AB"

Edit: another thing I noticed is that they partner with Slice to compete with E3D which provides integral extruder + hotend sub systems.

DocTrucker

@zapta not sure. Wasn't personally referring directly to them having patents, merely the idea that we should be brand loyal to a specific party because they were there first with and idea.

Looking forward to what comes out of the Bondtech/slice partnership. I've been watching that for a while.

droftarts

@zapta I believe Bondtech has no patent for using two hobbed inserts because it’s widely used in extruding MIG welding filament. Or at least, that’s what I heard. I also think other people did it before them, just didn’t commercialise it.

Ian

Kolbi

@zapta Seems GPL-3.0 License - or at least partially.
https://github.com/BondtechAB/Bondtech_Prusa_i3

zapta

@DocTrucker said in BMG vs clone test:

If the real grumble here is the fact that some of the east asian countries...

Confusing between Korean, Japanese, and Chinese is almost as insulting as confusing between Scots, Irish and Brits. Completely different animals.

DocTrucker

@zapta I did say earlier that I appreciated that not all countries in that area are the issue, hense 'some'. Not only China, and to be fair not only within east asia. Third World isn't accurate either. What's the best way to describe a country whose product can under cut competing nations due to their significant natural resource and low paid workers?

zapta

On a second thought, preventing Chinese cloning may not be that hard, Duet for example can lay out the Duet 3 components to say "Winnie the Pooh" or any other forbidden speech.

OwenD

@droftarts
Yes, they have been used in MIG welding for donkeys years.
All you need is something like this and all four wheels are driven.
You would need 1.7mm knurled rollers which are readily available and used for flux cored wires.
Then ditch the DC motor for a stepper.
https://www.ebay.com.au/itm/4RA-4-roll-24V-DC-MIG-Welder-Welding-Wire-Drive-Motor-Feed-Feeder-Roller-/183142075319

They larger drive rollers would provide more contact area on the filament.
A tad too big for a direct drive though

DigiD

Hey Jens

I pretty well have the same experience with the clone I purchased as you

I purchased the DotBit version.

I had some minor setup issues with mine , the grub screw would get loose and the same filament gears offset and grip pattern on filament that you observed.

Loctite for the grub screw and a small 3mm washer for the idler gear offset to pad it in one direction improved that.

"There was however a substantially amount of black dust. I examined all the bits and I have not been able to find where this dust comes from"
Same experience here , I have greased it lightly with silicon based grease that reduced it considerably

Today DotBit failed , at first I thought it was a setting in the slicer as I have just switched from s3d to Ideamaker . It printed the bottom part fine but failed when it it got to the smaller details and retraction activity went up significantly . watching it print while failing I could see the large white nylon gear was actually slipping on the main shaft .

I took it apart and just using my fingers and applying hard twisting could make it move on the shaft , even pull it off.

Plan A) Tried drilling the nylon and shaft to pin it but failed when I hit that stainless steel shaft , barely scratched it .

Plan B) Glue , but not just any glue . Pulled the nylon gear off cleaned the serrated shaft with alcohol and roughened the smooth inner surface of the nylon gear with a dremel . Applied Bondic a UV activated glue , a couple of drops spread on shaft serrations and inner face of gear and reassembled , then shone the UV light down the drilled hole and at the edges .

When I went to roughen the gear I did notice on the inner surface of the nylon gear it was totally smooth no serrated marks from the shaft at all , which really surprised me , the serrations of the shaft stood up a bit but probably needed to be significantly higher or sharper to cut the nylon .

I'm going to adopt a Chinese manufacturing and cloning philosophy here

“Cha Bu Duo”, which can be translated as “not far off” or “close enough”.

So far it seems fixed, managed to complete the print !

jens55

@DigiD, thanks for the 'heads up' I will check out the gear.
Which surfaces did you grease to reduce the black powder ?
The pinning would likely weaken the shaft too much so it's a good thing you didn't succeed.

DigiD

@jens55
I greased the large white nylon gear , same one that slipped .

Just enough to coat the gear teeth with out globs hanging off going around and around

I used a silicon based one that is fairly plastic friendly called superlube

Edit :
Clone usage details , purchased in May 2019 for 25AUD printed somewhere between 2-3kg PLA before it failed