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Piper Cub 1/4 scale dummy engine

Creation's quality: 4.0/5 (2 votes)
Evaluation of members on the printability, utility, level of detail, etc.

3D model description

Parts to make a semi scale Continental dummy engine for a roughly 1/4 scale Cub. The dummy is designed to duct air into the cowl. The size may need to be adjusted to suit your model, because of slight differences in cub models. The model can be resized to fit bigger or smaller models. I have made dummy motors for 1/3 and1/5 scale Cubs myself.

Parts include:
Left and right cylinders with exhaust tubes, intake tubes and pushrod tubes.
Baffle covers for ducting air over the cylinders.
Cylinder covers.
Gas cap with a hole for a brass tube.
Intake box/filter.
Exhaust muffler/end tube.

I use thick CA glue to assemble the parts.

For personal use only, not for resale.

3D printing settings

The parts fit a 200x200 mm area as supplied.

I printed mine from PLA.
I printed mine at 0.2 mm layer height.
Two outlines is enough.
25% infill is enough.
Support is necessary under the exhaust tubes and filter box.

  • 3D file format: STL and ZIP
  • Last update: 2020/10/27 at 12:13
  • Publication date: 2016/10/15 at 16:52





Norwegian inventor/designer/cat owner.

Please don't ask for original design files or parametric files.

If you ask a question about a design, ask under the design so that I can answer there.

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The Hobbyking Cub is 1:4,5 scale so scaling the parts to 88% will make them the right size. Expect a weight of 100-150 g.

Sorry for the disappointment. It's an old design and I will lower the price. As it says above it's a semi scale dummy engine. I never claimed it to be a perfect scale engine. The only support you need is under the exhaust pipes. I have printed several exactly as they are set up in the files. The air baffles over the cylinders glue in place easily after printing. If you're not happy with it please contact Cults for a refund.

Overall these are okay. There are no mounting points for the eyebrows. You will have to come with your own. The corner seam quality of the eyebrows is poor. While this engine is much more detailed than what comes with many kits, I would consider it stand-way-off scale. It will take a lot of complex supports to print as supplied and I will be making many changes before I even try it. It's hard to tell what you're getting from the pictures and I expected a lot better for the money.

I don't use Cura myself.Not sure what's wrong. It should slice correctly in Simplify 3D with 0,4 mm extrusion. It must be a problem with your settings.

How do you slice it with cura? i do not scale down the model

If you hav escaled it down to a smaller size then the text will obviously also be smaller.

Try setting it to 0,35 or 0,3 then. It's possible to print as thin as 0,25 with a 0,4 mm nozzle with good printers.

It is set to manual with 0,4mm

If the continental letters don't show then the slicer probably creates an extrusion width higher than 0,4 mm.In Simplify this can be set independent of the nozzle width.

Hi, how do you print this model and what setup on simplify3d? I cant get the continental letters sliced :(

Thanks for that, any chance you email me that to please? The model of the engine looks fantastic, but I only have a small printer. This will be used on a 1/6 scale Cub.

I added a zip file now with the separated parts.

Hi, Is there any way you could supply stl files of the individual parts? I can't seem to separate them and they won't fit in my printer all in one.

How can I separate the pieces to print them individually? Thanks! Chad

How can I print these parts separate? Is there a way to separate the pieces? Thanks! Chad

For 1:6 scale rescale the parts to 66,67% in the slicer.

can I find the finished files on a 1/6 scale ?, do I need them, or alternatively, what scale can I change? and the whole scale is 1/6
Regards -Kari-

Hello mate! I had my sons teacher print the engine but some parts didn’t turn out that great. He ask me is there anyway to print just the parts that didn’t turn out that great.? Thanks! Chad Cole

The whole part bundle takes up 192x198 mm of print area in 1/4 scale size. If you separate the parts it takes up less.

Can you provide the dementions of the dummy engine please? I have a friend that’s going to print it for me. Thanks!

@AMC You can scale the model to any size you want in the slicer. 80% scale is close to 1/5 scale. I have printed 1/5 scale version and even 1/3 scale versions myself.

I am interested by this model 3D but I do not know the drawing 3D. I will want to know if there is the possibility of having it on scale 1/5 because I have a model on this scale or to give the report to be applied before impression.
Thank you.

Hi Thank you so much.
When you do any new components for rc aircraft please notify me.
Thank You
Pieter Frylinck

Hi, paf.

You can separate the parts in your slicer. The slicer should have that function. In Simplify 3D it's called "Separate connected Surfaces".

Hi I just downloaded your dummy engine. Is it possible to get the files individually. So that I my print each one separately.

Will appreciate it.
What else have you got for piper cubs ie dash etc.
Thank You
my email

Hi. The original CAD is designed in 3D STudio Max as a mesh, so the STL is the same as the 3DS model.

Hello, I purchased this Piper Cub scale engine model in .stl
May I ask you to send me the original 3D CAD file? That way I am able to export an even finer .stl because I want to minimize the finishing on the printed part.
I really appreciate your work and your support. Thank you very much.
Best regards, Hans-Ulrich Peyer

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