This is a fully printable airboat or swamp buggy or swamp boat with adjustable motor angle.
For those interested I will also be selling printed kits on my website: https://aerofred.com after I finish testing, taking photos and filming it.
In page 3 there is a wooden hull that can be cut with a cnc router, the dxf files are there to download.
Hull length: 700mm
Hull Width: 240mm
Print weight: Aprox. 850g
Motor: 3536 3542 1100kv outrunner
Servo: Mini Servo, HS81 type
Included are the STL files and also .factory files for Simplify3D and Gcodes for a cr10/cr10 mini with direct drive.
Also included the hull unsplit in two versions, one is single wall to be used if you want to print with 3 or 4 perimeters, you will have to split it to fit your printer, the idea is to split in the least number of parts possible. The other one is a double skin hull with a keel, this should be printed with only one perimeter and the double skin should be enough to keep the hull watertight, it has a filet in the transition from the back flat panel to help to seal.
These unsplit hulls have not been print tested.
Can also be printed on a prusa i3 mk2/3, its just a mater of opening the factory files and rearranging the objects, they will all fit.
Print specs are commented in the gcode files.
You will need:
4mm carbon fibre tube for the rudder post
6 M6 nylon screws
4 M4 nylon screws
The motor can be a 3536 out runner with a 3s 2200 battery
The servo can be a mini size (HS-81) type
A rubber balloon to seal the hull battery opening, it will be cut in half and stretched around the hull rim.
The motor wires hole can be sealed wit a bit of silicone sealant, just a blob.
This project will use about 850g of filament, I tested it with PLA but PET-G or ABS can also be used.
The hull is printed with 2 perimeters and no infill
The motor mount and pod are printed with 3 perimeters and 20-30% of infill
The remaining parts can be printed with 2 perimeters and 10% of infill
Each one of the hull sections should have 3 bottom layers to create compartments
The Hull1 (the front) should also have 4-5 top layers to close well.
Make sure the hull is watertight
You can always use CA and kicker to close small gaps in the joins and several coats of clear acrylic paint or epoxy to seal the hull.
Only the hull perimeters number is critical because of the inner structure distance to the skin, the rest you can print however you like.
Nozzle is 0.4mm
Extrusion width 0.42mm
Layer height 0.24mm
More detailed info can be found commented at the top of the gcode files.
Please post your makes and pictures, if you make videos please post the link in the comments
Video by Bob Neitzke
30.7.2018 Added unsplit hulls redone the gcodes