Victor III

[bwi 971]

"Tolerance". Now there's a word I don't hear around these parts very often - especially when the boys start talking about 3D PRINTING! (Crash of thunder as the Great Oz awakens).

He just can't react anymore Scott…….the first post made him press the F and Y key on his keyboard through his desk and his fist through the monitor.
I think he probably will calm down in a month or so LOL

Grtz,
Bart

[HardRock]

"Tolerance". Now there's a word I don't hear around these parts very often - especially when the boys start talking about 3D PRINTING! (Crash of thunder as the Great Oz awakens).

[Subculture]

That's true, but a machine capable of rendering something to within around 0.3% displays greater than non-existing accuracy. Even the most expensive machines will exhibit a tolerance.

[bwi 971]

No we are not...but this is the way I like to work.....not judging on others who do it differently.

Grtz,
Bart

[Subculture]

0.6mm out on a 199mm print. Not how I'd describe non-existent accuracy. If I was hand working, or even machining out a pattern i'd be more than happy with that. We're not building stuff to go to Mars.

[bwi 971]

It was not a surprise for me, I read a lot of stuff before I bought a Chinese lottery ticket, in the end I was mentally prepared to accept it.

Most people use to print game figures so they don’t even notice it.

It’s incremental with the size, for example the sail in length is 0.6mm off (199.6 instead of 199mm). and it’s dimensional. If you have a curved slot like I have, you have to adapt the whole perimeter of the sail to get it in the slot. Nothing that some sanding can't fix, but its not plug and play.

The SOKS are small so the dimensional inaccuracy is neglectable, hell the dimensions are a raw guess anyway.

In the slicer the dimensional accuracy is spot one, I was informed the it is also depending on the resin, each batch hat his own sweet spot, exposure time has to be spot on, etc…..

One could play with the percentage in the slicer but most of your parts need to be angled for printing, so it’s not so evident to do, you need at least a few test prints to get it right. And large prints like that are demanding on the FEP film, so you don’t. Further you have to do it by try and error on every new part that you are going to print.

You can of course work around it in the design phase, and design the stuff that you like to print in a way that it’s not dimensional critical, that is the easy fix imo.

Grtz,
Bart

[Subculture]

'the dimensional accuracy is non-existing'

That's surprising, how far out are we talking about here? Tinkered a bit with an FDM unit, and the accuracy is excellent, and it's a very cheap model. I'd have expected the accuracy of DLP to be greater, only one axis to move, and a light bounced off of the chip to render the layer. Are the optics the limitation in these cheaper units.

[bwi 971]

I wonder how cheap those DLP based printers will get? Some can be had for under £200 now, although the resin is pricey. They do render superb detail.

My experience is that it is a lottery Andy...you have to be very lucky to get a good one, else it’s a nightmare.......resin is expensive as you mentioned, and toxic as hell......all other consumables are expensive too and or have a very short lifetime..... the dimensional accuracy is non-existing......the cleaning process is very messy and afterwards your left with an amount of toxic wash residues.......and then you need a UV curing device. While printing you need to have a good ventilation/extraction.
When I work with it I wear so much PPE that you will think that I work at a toxic waste dump or something.

Bud .....when everting lines up and works out….those things give you amazing details.

It's all about what you get for the money you spent, don't expect dimensional accuracy and long lifetime with these low budget printers. If you want all that you have to spent 4k.
I didn’t so I’m not complaining, I knew what I was getting into, just want to share my experience regarding what you will get for your money and what to look out for.

Grtz,
Bart

[Subculture]

I wonder how cheap those DLP based printers will get? Some can be had for under £200 now, although the resin is pricey. They do render superb detail.

[He Who Shall Not Be Named]

Oh my goodness I started laughing in a waiting room. I probably looked like a crazy person. I showed Tina your message and she laughed.

LOL. Sorry, Tina, that your were subjected to this nasty, thoughtless, antagonistic, trolling perpetrated by your kit-assembling, robot-loving husband.

David

[trout]

Oh my goodness I started laughing in a waiting room. I probably looked like a crazy person. I showed Tina your message and she laughed.

[He Who Shall Not Be Named]

F you, Tom!!!!!!!!!!!!!!!!!

David

[bwi 971]

Outstanding! How did you make the louvers? AND, did you cut the holes ans slots or cast them - I can't tell.

Everything was done by the machine this time Scott....I only assembled the parts, made them fit.

The sail will be cast with the holes......louvers will be after fitted.....hatches and doors you must do yourself.

My idea behind it is that you can chose if you want certain pieces in open or in closed position......radar, periscopes,.....

Grtz,
Bart

[bwi 971]

3D printing,Skill!

Oh boy....that will have the dragon unleashed for sure

[trout]

3D printing,Skill!