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Things I would like to 3D print

jmtd.net

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Re: Things I would like to 3D print

#91

Post by jimnotgym »

dekhn wrote: post #86
jimnotgym wrote: post #47

Funny story. I bought a printer for my kids this year. An Anycubic Mega Zero with a magnetic base. It stays pretty calibrated but I have struggled with base adhesion once a few prints have been through it. IPA and abrasives have not fixed it...maybe I will get around to some other things...there have been a few random failures, but not many. We printed a few novelties items that came out OK. The real learning curve i…

pretty sure you weren't "arrested"- ah you said you're in UK, not the US.

Well he said the words, 'I'm arresting you on suspicion...'. He later 'de-arrested' me. He also told me that details of my arrest would remain in the Police database... which is nice

Re: Things I would like to 3D print

#92

Post by jimnotgym »

wlll wrote: post #81
jimnotgym wrote: post #47

Funny story. I bought a printer for my kids this year. An Anycubic Mega Zero with a magnetic base. It stays pretty calibrated but I have struggled with base adhesion once a few prints have been through it. IPA and abrasives have not fixed it...maybe I will get around to some other things...there have been a few random failures, but not many. We printed a few novelties items that came out OK. The real learning curve i…

> It stays pretty calibrated but I have struggled with base adhesion once a few prints have been through it. Try using a heated bed and enclosing the printer in a chamber to prevent draughts (anything will do, cardboard). A heated bed and IPA work for me.

I do have a heated bed. A cabinet would be nice as protection for the printer as well. One day!

Re: Things I would like to 3D print

#93

Post by dTal »

jimnotgym wrote: post #47

Funny story. I bought a printer for my kids this year. An Anycubic Mega Zero with a magnetic base. It stays pretty calibrated but I have struggled with base adhesion once a few prints have been through it. IPA and abrasives have not fixed it...maybe I will get around to some other things...there have been a few random failures, but not many. We printed a few novelties items that came out OK. The real learning curve i…

Could this have been a good cop / bad cop routine? Officer 2 was encouraging you to break the law. It is an offence to manufacture, import or sell a realistic imitation firearm, or to modify an imitation firearm so that it becomes a realistic imitation firearm.

Re: Things I would like to 3D print

#94

Post by dTal »

jimnotgym wrote: post #68
throwaway2077 wrote: post #55

Earlier quoted context omitted.

is that a normal experience in all of the US or only certain states? sounds all kinds of fucked up. the random passerby ratting you out. cops showing up over a handgun, which as far as I know are legal to own in all states unless you're a felon. doesn't sound like land of the free at all.

I'm in the UK, should have said. There are almost no authorised civilian uses of handguns in the UK since the Dunblane shooting. I think you can have one for humane despatch of deer (subject to extraordinary proof of need), but that is all. https://en.m.wikipedia.org/wiki/Dunblane_massacre

>I'm in the UK, should have said

No. Fight the American default!

Re: Things I would like to 3D print

#97

Post by dTal »

somewhereoutth wrote: post #46
fnord123 wrote: post #41

Earlier quoted context omitted.

Would 3d printing work there? Isn't there a whole bunch of crystallization hoo-ha around metals and how they are made to make sure they can handle high stresses? e.g. knives being folded many times; rotor blades in jet engines grown from a single piece.

Exactly. 3D printing makes an approximation of the 3D space occupied by a given part, and nothing more. For some parts this is sufficient, for most it is not. There is a whole history of materials science and production techniques to get to the 'stuff' we have today, 3D printing is rather 1 dimensional in comparison.

This comment goes a bit too far the other way. 3D printing is a manufacturing technique with its own possibilities and drawbacks which you need to be aware of, but it's very possible to make engineering-grade parts with 3d printing - for some things, it's even the state of the art. You can eliminate layer stress lines with annealing, and you can print interior shapes that would be impossible to injection mould. I myself have made polycarbonate fan blades, only a few mm at the thickest point, with a tensile strength tested to over 500 kilograms. Their theoretical strength is much higher still.

Re: Things I would like to 3D print

#98

Post by sharklazer »

dTal wrote: post #93
jimnotgym wrote: post #47

Funny story. I bought a printer for my kids this year. An Anycubic Mega Zero with a magnetic base. It stays pretty calibrated but I have struggled with base adhesion once a few prints have been through it. IPA and abrasives have not fixed it...maybe I will get around to some other things...there have been a few random failures, but not many. We printed a few novelties items that came out OK. The real learning curve i…

Could this have been a good cop / bad cop routine? Officer 2 was encouraging you to break the law. It is an offence to manufacture, import or sell a realistic imitation firearm, or to modify an imitation firearm so that it becomes a realistic imitation firearm.

Where?

Making guns at home is as American as apple pie.

Re: Things I would like to 3D print

#99

Post by Someone1234 »

sharklazer wrote: post #98
dTal wrote: post #93

Earlier quoted context omitted.

Could this have been a good cop / bad cop routine? Officer 2 was encouraging you to break the law. It is an offence to manufacture, import or sell a realistic imitation firearm, or to modify an imitation firearm so that it becomes a realistic imitation firearm.

Where? Making guns at home is as American as apple pie.

They're either in the UK or Germany. But I suspect the UK.

Re: Things I would like to 3D print

#100

Post by varelse »

ravenstine wrote: post #75
jimnotgym wrote: post #73

Earlier quoted context omitted.

All Good tips, thanks. I think I would get more use out of it if I acquired some basic CAD skills!

If you can code, OpenSCAD might be the best place to start. I have 3D modeling experience, but CAD is sort of a different beast and a skill of its own. Most of the free tools that exist are pretty complicated (FreeCAD makes me want to claw my eyes out) and the professional software packages are outrageously expensive. Once I found OpenSCAD, which is basically just modeling by code, I got way more use out of my 3D pri…

OpenSCAD's biggest problem appears to be that it is single-threaded. I learned this from a guy printing parts for my RV. Is there an open CSG package out there somewhere that does operations like Minkowski Sums as convolutions so that they can be expressed as multiplies in frequency space and then brought down to real space for tessellation? Not only could you take that multi-threaded but you could potentially run it on a GPU hundreds of thousands of times faster.
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