3D printers

 
  konkos Assistant Commissioner

Location: Live next door to half-bar
Some time ago, Aldi's were selling 3D printers and by the time I got they were all gone.  I am most curious if anybody bought one and got to use it and what their feedback is. Aldis usually bring such items back onto the market every 6 months or others every 12 months.
konkos

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  viaprojects Train Controller

it's a fad item - Officeworks had a cheap 3d printer for sale. Jaycar stripped down left over 3d printer kits.  but both do offer an updated product via special order at a higher standard market price. for aldi it would be a one off thing .....
  TomBTR Train Controller

Location: near Sydney
Excuse the language ...





https://youtu.be/jDLz3THJX2s

I could do with a few of these for my 7 1/4" rolling stock. However I have no idea how strong they would be.
  KRviator Moderator

Location: Up the front
Very cool! But it'd be an expensive way to find out they aren't strong enough, unless you had a backup! Has anyone ever put a scale between wagons to measure the actual draft forces in miniature rollingstock?

I was thinking these printers would be useful for those funky shapes you see on some older rollingstock, with compound curves  like the bulldogs or areas that can't be shaped from flat stock easily. XPT Nose cabs, the NR head/marker light surround, things like that. The Aldi version seems to have a printable size of 200x200x180, so that looks to be just a little too small for 7.25" full-width carbodies, but I'm sure you could make two halves or something similar.

Next time they come up, I'll be getting one though!
  lkernan Assistant Commissioner

Location: Melbourne
I was thinking these printers would be useful for those funky shapes you see on some older rollingstock, with compound curves  like the bulldogs or areas that can't be shaped from flat stock easily. XPT Nose cabs, the NR head/marker light surround, things like that. The Aldi version seems to have a printable size of 200x200x180, so that looks to be just a little too small for 7.25" full-width carbodies, but I'm sure you could make two halves or something similar.
KRviator

I'm doing a set of 1:24 scale Tasrail ZC class bogie sides in my printer at the moment.  
They just fit in my Davinci's 200x200 bed, but the edges tend to curl a bit with things that wide.

Printing them in halves is working much better.
  7334 Chief Commissioner

Location: In the workshop wondering why I started 7334 in the first place
I have been slowly building a string of NSWGR four wheeler good wagons in 7¼ inch gauge and for the latest, an SCA Shell Tank as displayed at Thirlmere, I decided that the most practical way to create some of the parts might be 3D printing in plastic.  To do this I bought an Ender 3 PRO 3D Printer which received some good reviews although it is at the lower end of the range.

I was thinking in terms of parts which are more cosmetic than mechanical or structural.  I am not going to try and use plastic wheels/axles/axle boxes etc but some parts have to be able to support some weight.  An example is the "saddles" which support the tank itself which is formed from a length of 250mm storm water line with MDF ends together with a number of other bits and pieces like a dome and walkways.

While I used PLA plastic for the multitude of test prints to prove the various designs I intended using ABS plastic for the "production versions" of these parts as it is stronger and more tolerant of temperature.  The rolling stock sits down in the workshop most of the time and I have known the temperature to get to 50 degrees Celsius in the middle of summer with it all locked up and I understand that is approaching the limits for PLA.

Having laboured for a couple of months on the design of the five parts I want to (initially) manufacture I tried printing with ABS, an effort which was far from successful.

I have been doing a fair bit of Googling of bed adhesion problems with ABS and I am working through some of the options which have come out of that.  One is Kapton tape for the bed which I have ordered but not yet received.

One I discarded was building an enclosure for the printer to increase the overall temperature of the environment it operates within.  That sounded like a recipe for setting the house on fire or frying the electronics in the printer.

While it will take a lot of the achievement out of the exercise a last option is having the relatively small number of parts commercially printed although that is going to get costly as I have estimated about 70 to 80 hours of printer time is involved.

I am wondering whether anyone else out there in model engineer land has tried what I am now attempting and how you went, and with what filament material?

I am also wondering whether anyone has used PLA for parts and how it held up over time particularly with regards to surviving high temperatures.

P.S. Moderators : While this is an old thread nothing else came up in search and what I have posted seems to (sort of) follow on from the older posts as 3D printing is a developing process.  If you want to move it elsewhere go for it.
  dthead Site Admin

Location: Melbourne, Australia
I'll Ok it as acceptable 7334.  report back ! Wink

David Head,moderator

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