Re: 3D printing (Was: New early P&R steel.....)
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1. Yes, Parts can come out different sizes if printed along its length or across its length.
2. Out of the printer I can say it will hold +\- 0.002” over an inch, but it can shrink or bend when in the wax removal oven. It will shrink different percentages depending on the print orientation in my experience. It can also vary between bottles of material. I think Shapeways has taken into account the other variables in their spec. 3D Systems is giving best case scenario, remember they are trying to sell printers. Shapeways or anyone else is going to have the same issues if trying to print so many of the same part, especially if they are using more than one printer to print your order. Its very possible some parts were printed along the length and some across it.
3. As for making masters for resin, I never have to print more than two of a part(two sides or two ends for example) and I print them both at the same time in the same orientation. If the size is a bit off, no big deal as long as they are the same.
I am a bit perplexed why you are printing so many of the same part, it would be much more cost effective to make a mold of each part you need and cast the rest. Prints are expensive compared to casting.
As for using 3D prints for low volume production, a bit too expensive at this point. A 2 kg bottle of material for the Projets costs almost a thousands bucks. Support material is about half that. They also purge a lot of material to keep the jets that aren’t used in each pass from clogging up. Casting Resin is way cheaper.
I know some others are printing full body cars on printers like the Form2, for me the parts show too many layer or support effects. Too each there own.
4. The Form printers and others like it make very nice parts like figures and such. But as Dennis pointed out they are made like paper printers, I don’t see the accuracy coming out of these. I have printed an End I have designed on more than 20 different printers now including the Form2. They were all unusable, except for the parts from the Projets or the Multijet printers from Stratasys like the Connex series.
In fact the master pattern I use for one of my kits uses this End and has three pairs on it. Two sets were printed on the Strataysys Connex and the other set on the Projet, I challenge anyone to figure out which came from what printer.
The ends from all the other cheaper consumer level printers come out with massive warps or poor resolution.
The Form3 has peeked my interest but I am not buying one until I can test print the same End on it and see if it comes out warped or not and with the same quality as the jet style printers. These style printers are challenged by thin flat parts like ends and doors IMHO, I really hope it’s a break through though.
Printing an end with an easily removed box on the back may solve the warping issues, something to try out as it may help resist the peel effects when the head raises.
Also I don’t work in the 3D printing industry per se, I manage a Machine shop at a University where we make specialized devices for research. We have every tool under the sun and a bunch of 3D printers. I’ve worked with almost every type of 3D printer over the last fifteen years. The best part though is how every company is trying to sell us there latest 3D printer, I get them to test print my same End as a comparison to our other printers.😜 It makes it easy for me to compare them and I get to do some side research to see if it’s worth it for me to buy one personally. I haven’t bought one yet.
On Dec 23, 2019, at 4:37 PM, dalemuir2@... wrote: