by Erikw, published
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Fully 3D printed RC snowmobile. Fully functional with working suspension. Works surprisingly well in snow. The only issues I had, is the front control arms that snaps if you jump to high.
This is not a easy build and you need some CAD skills to make motor mounts and
if necessary some other parts. You also need some RC skills to get the best motor setup and calculate the gearing.
What you need besides plastic:
RC stuff like transmitter and so on
Motor, speed controller, and transmission between motor and drive shaft.
5x150mm steel rods for steering axles (cut to fit)
4x400m steel rods for the rest of the axles. Like the shock absorber, suspension and drive shaft (cut to fit)
4pc Springs for shock absorbers inner diameter 7mm and ~17mm long depending on how hard suspension you want.
6pc Ball bearings 8x4x3mm for drive shaft, upper wheels and big lower wheels.
Some stiff 2mm wire to use as wear rods under the skis.
some M3 screws with nuts
*4 and 5mm set screw shaft collars or equivalent
The chassis is glued together with hot glue. The bearing bracket is bolted to the chassis with M3 screws and so is the front suspension. All the steel rods is fitted with set screw shaft collars. The seat is held to the chassis by magnets at the rear and is easy to remove to change battery.
The power plant and gearing is a little tricky. I used a hobbyking 36mm 550w inrunner and toothed pulleys with a gearing of 9 to 42. I chose this setup because I thought needed the power but its to overpowered and a little heavy. I recommend to use a smaller high torque engine.
Please send me your questions and I will update with more information.
I used resolution 0,3 because I'm lacy but 0,1 is recommended for better finish. Support is needed at the front half of the chassis and the rear suspension runner. If you print in ABS you gonna have some problems with warping. I used Kapton tape and glue to prevent warping. I think PET is the ideal plastic for this build.
The track is printed in Ninjaflex Shore 85A. But other flexible brands works as well. No support for the track.
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RC Snowmobile by Erikw is licensed under the Creative Commons - Attribution license.
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