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CNC: Better 3D printing


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#1 Dennis David

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Posted 30 December 2017 - 10:31 AM

Its all about the materials

Designed to strong, high quality, uncompromised parts, Markforged 3D Printers are the worlds first 3D printers capable of printing continuous carbon fiber, Kevlar®, and fiberglass. Using a patent pending Continuous Filament Fabrication (CFF) print head alongside a Fused Filament Fabrication (FFF) print head, Markforged printers can create functional parts by combining our specially tuned nylon with continuous fiber filaments.

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#2 MSwiss

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Posted 30 December 2017 - 10:33 AM

Price?

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#3 Gary Adams

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Posted 30 December 2017 - 10:36 AM

Onyx One $3500, Onyx Pro $7000

Straights are for fast cars. Turns are for fast drivers.


#4 Dennis David

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Posted 30 December 2017 - 10:47 AM


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#5 Dennis David

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Posted 30 December 2017 - 10:49 AM

Not a matter of if, only a matter of when I buy one of these babies.

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#6 Ecurie Martini

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Posted 30 December 2017 - 11:06 AM

The day I win the lottery!

 

EM


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#7 Dennis David

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Posted 30 December 2017 - 11:10 AM

Just to be clear Markforged makes a carbon fibre printer and a metal printer. From what I understand the last process is to stick the part in a small furnace. The carbon fibre printer does not require that step. Carbon Fibre is fine for slot cars, we don’t need titanium. LOL

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#8 Ecurie Martini

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Posted 30 December 2017 - 12:23 PM

While hardly an automated process, I have made slot car bodies by pouring a very thin resin layer in a rubber mold and, before demolding, reinforcing the body with a layer of carbon fiber scrim* set in epoxy.  The result is a light and very strong body.  I use epoxy as a matrix for 3 reasons:  Slower setting (hours vs minutes) allows time to place and saturate the fibre; better adhesion; cured epoxy is flexible whereas polyester tends to be brittle.

 

EM

 

* a very thin sheet of randomly oriented fibres in a binder vs the typical woven cloth-like material


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#9 Dennis David

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Posted 30 December 2017 - 12:50 PM

Guys use Carbon Fibre to reinforce GFK bodies.

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#10 Ecurie Martini

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Posted 30 December 2017 - 01:26 PM

Guys use Carbon Fibre to reinforce GFK bodies.

 

GFK?

 

No claim to invention - just an observation on utility of CF

 

EM


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#11 Dennis David

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Posted 30 December 2017 - 02:18 PM

Fiberglass

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#12 Mr. HP

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Posted 03 January 2018 - 12:53 PM

I’ve had my Markforged Onyx One printer for a little over a year now. So far I have no complaints, It’s the best FDM style printer I’ve ever used. My only regret is not budgeting for the Onyx Pro, but I know it can be updated later. The onyx material by itself is good for most slot car applications but in my experiences it hasn’t been rigid enough to make chassis components and it has a tendency to warp. I really need that second print head to make fiberglass reinforced parts. Until I can upgrade my Onyx One I still prefer SLA, SLS nylon printed parts, the resolution is fantastic and I’ve had good success making stuff that takes some abuse and doesn’t warp or break. 

 

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Onyx One material

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#13 Dennis David

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Posted 03 January 2018 - 02:10 PM

Have you tried Acetal Delrin? I understand its tricky to print so I will try to Mill with it.

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#14 Dennis David

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Posted 03 January 2018 - 02:11 PM

I was thinking pods, and uprights. Would use aluminum or brass for the chassis

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#15 Dennis David

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Posted 03 January 2018 - 03:43 PM

it seems like carbon fibre would work with continuous fibers but that's not really practical for small parts. Acetal Delrin is a very interesting material but tricky to print. Would need a printer made to use the material. Milling looks still to have it's advantages for the price point.


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#16 Mr. HP

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Posted 04 January 2018 - 08:15 AM

Never printed with Acetal, but I've machined a ton of stuff out of Delrin. For slot car stuff you are better off with nylon, higher tensile strength and lower thermal expansion.

#17 Dennis David

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Posted 04 January 2018 - 12:05 PM

Are you talking printing? I was going to hold of on printing and experiment with milling.

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