Adventures in 3d Printing.

[Keith Hayes]

I have had mixed success over the past year with 3d printing. I got an Elegoo Saturn 5 almost on a lark, to help with parts for a model for a friend. With that project completed, I decided to go back to the beginning,  calibrate my printer and tune up my modelling skills. A constituent issue is that I think SketchUp is agnostic regarding the solidity of 3d forms. But there is an add-on for that.

An upcoming project is telegraph and electrical insulators. I decided to start small and simple, and in conjunction to the insulators, I developed some NBWs. You can see these tests in the middle. This is my second batch of insulators, and the new ones rendered very nicely,  about 5" tall and 4" at the bottom. The NBWs are okay: these have 1" bolts, which printed fine,  but are not as fine as Grandt 100s. The larger bridge washers are neat: the raised ridges, about 1/2" tall and 1/2" wide came out well.

Many 3d printer types are gamers, and use their machines to make miniatures and figures for fantasy games. Consequently, one of the calibration parts, "cones of calibration, " has a fantasy spin. If everything is correct,  the beer snaps off and fits in the ale tankard, and the sword snaps off and fits in the skull.

Someone else created a model where three small boxes fit into one another.

The successful prints are at the rear of the scene on the right, and two raw parts are on the left.

The Saturn 5 has a routine that allows me to print 8 parts at the same time, each with a different exposure setting. The successful prints exposed the resin to the UV light for just 3 seconds per layer.

The whole process is a balance of the exposure, how far the build plate lifts, and how fast and how long, and how fast it moves back for the next exposure. Even though the plate is moving a short distance (1-2 mm) the forces within the liquid can be significant. Also, these prints are small (short), so only took about 30 minutes. A Sn3 boxcar,  rotated to optimize all these factors could take 4-6 hours.

I am bouyed by my results. I plan to order some clear resin to produce the insulators. I understand this introduces som othe complications in that the UV light bounces places it is not wanted. In any case,  these could turn out to be neat details. I have started to model windows for the Breck depot, and the Climax mine office windows, doors and formers will not be far behind.

[drgwcs]

Great work Keith. It is amazing what 3D printing is doing. I do not have one myself but have a friend at the club Dylan that has done several projects for me.
He just printed the Forks Creek Section House from Charles Dollins' plans
The grounded boxcar next to it was the first test print on a boxcar that the width was off and the roof didn't work right- but it was perfect for this with some tarpaper and a bit of modification. Even mistakes can work great. (The stone building that is not prototypical is an old Morse Productions plaster casting)


These are all done with modified files from Thingiverse- they are not exact (especially in the stakes) but not bad- I also have a boxcar in progress.

[Chris Walker]

I've been known to do a little 3D printing with my welder and grinder, every now and then.

A West Side Lumber groundthrow for those who don't recognise such mundane hardware; suitably reduced by 25% to match my 18" gauge Tramway.

[Paul R.]

Neat!

[pizlinard72]

Wonderful results Keith.
3D printing is really an incredible technology. Even larger printers that can be used for O scale give great results. Here is a fishbelly flat car after the printing and curing process. I only have to add some brakelines, stakes and it is ready for painting.

Had a steep learning curve but that is inherent all new technologies.