3D printing for 7mm scale

[AndyH]

Hello,

I have commented a few times upon the subject of 3D printing so I thought it was about time I showed examples of what I am trying to do.

The following are photos of a 7mm GWR spark arrester, using information from the original 1935 Swindon drawing number 105119, modelled in Fusion 360 (full scale), and printed at 0.025mm layer height on a Form 2 printer. The support touchpoint width was also modified from the default thickness so as not to obscure detail or cause breakages upon removal.

The model is a JLTRT 57xx, which will be a Truro engine, most likely 5744.

The aim was for it to run in two versions, with the dustbin, and without. Though photographs show the chimney being shorter than the original drawings.

The parts need an ultrasonic clean, and some cruel close ups.

I used clear resin as it was all I had left over from a project.

There was an issue with the upper seam due to the angle of the build. I will thicken the part to try and offset any issues. This is part of the challenge in balancing scale accuracy and the limitations of the device

The nuts are perhaps over-scale in terms of those selected, but I wanted them to be visible and they met the size on the drawing.

I aim to investment cast a version when and if I make time.

Hope this is of some interest.

Andy

Edited August 7, 2021 by AndyH
edited for late night typos

[5D_Stoke]

An impressive print of an unusual item, a perfect use for 3D printing to produce parts to customise kits and ready-to-run.