Tiny Train (Customizable)

thingiverse

Tiny Train - 2023 Vendicar Decarian - Placed into the Public Domain - Dec 2023OpenScad Script providedThe SCAD file provided along with the .stl filesare a model for a tiny train, children's toy, similar in shape to the OpenScadtiny train by Torsten Paul 2019.His model code was 44 lines ling.This model is considerably longer almost 600 lines.The complexity arises from different model options scaling and the need tobreak the file into parts in order to minimize support structures and toproduce alignment surfaces so gluing the parts together is very easy.For ease of operation use the OpenScad customizer to set the various modelfeatures with sliders and buttons.The model can be scaled, from 100% which spans a 220 mm print bed to 1/4 scale.Scaling to 50% has been tested.Scaling brings with it issues however. When scaled some features becomeimpossible to print, and impossible to handle even if they could be printed.The cab whistles are such an item.Similarly the wheel axel's become very small and difficult towork with.For sizes less than 30% it is probably best to print the model in a non-rollingversion.When "Rolling" is de-selected the wheels are brought in closer to the train bodyso that they weld with the undercarriage eliminating the axle issue.The Cab whistles can be deselected entirely. They print as the upper sectionof the Whistle only. The stem connecting it to the cab is too delicate to beprinted.I suggest connections to the cab be done with a small piece of bent copper.There is a dowel pin in the front for a cow catcher if you wish to implementone.Axel'S Are intended to be made from monostrand wire that runs from the wheel capthrough the wheel and into the undercarriage.It is recommended that the wire be cut to size and then glued to the wheel cap.Once affixed to the cap. the wire is then passed through the wheel and intothe undercarriage where it is to be glued.The hole runs straight through the undercarriage so it can be quite long onthat side.In order to prevent the wheel hub from being glued to the cap or undercarriage,either be very careful, or use a little wax paper between the joints, or just coatthem in a little bit of petroleum jelly.Axel_HD is the variable that holds the Axel diameter. The variable $EC (extrusion correction) is added to the diameter to correct for filamentflow into the axel holes.$EC is printer/nozzle extrusion error correction parameter that is set by default to 0.3 mm.