Superseded by NANO 500 V1 https://www.thingiverse.com/thing:3678421
I trained as a mechanical engineer but worked mainly in advanced control systems and computer modelling, now retired.
For many years I actively competed in dinghy racing and designed/built two National 12's. Subsequently spent 10 years sailing a 32' keel boat.
Recently became an enthusiastic 3D printer - Geeetech A10.
I came accross this design a few months ago and became fascinated by the prospect of combining 3D printing with my past sailing experience.
I intended to basically take the 'ebdill' design and modify it to: -
---1) Make it more suitable for printing on 3D printers with size limits of around 200 by 200 by 200.
---2) Incorporate some diagonal (semi-circular) skin stiffening.
---3) Incorporating as many components as possible into the 3D print (e.g. keel case, rudder mount and joint supports) to simplify the build.
Unfortunately 2) proved to be more difficult than expected and was eventually dropped.
The diagonal stiffening always effected the smoothness of the skin and I could not arrive at slicer/printer settings that produced an acceptable result.
Thingiverse member 'footytom (Thomas from Germany)' printed many of the early attempts and highlighted problems - many thanks.
'footytom' originally used PAL filament but noticed that this did not work well.
He intends to move to PLA +, but reports that the company Gehr in Germany has recommended PC/ABS (https://www.gehr.de/images/pdf/Flyer_PCABS_DE.pdf).
It should be more stable, thermally tolerant and avoid problems when leaving the boat in sunshine. However light coloured PLA should also be perfectly OK.
The design presented now (16/12/2018) has not been fully completed but has been advanced to a point that is expected to produce reasonable 3D printed results.
At this point in time the position of the bulb is a best guess and may well have to be fine tuned at a later date.
In addition consideration will be given to any member suggestions to improve the design further and/or make it better meet the class rules.
In effect this is a design in its infancy and should be expected to develop further during 2019.
The following constants are used in the design: -
---Tol=0.28mm - clearance between mating parts
---Beam=120 - beam in mm, equivalent to ebdil's 117%
---Height=1 - scale factor for height of the hull
---BulbPosition=10 - position (in mm) of the bulb keel from the base position
In principal any of these constants can be changed to suit particular design requirements.
In practice the design is sensitive to changing some of these constants without some rework in Onshape.
These are the principal slicer settings (for the hull) that I use however I cannot guarantee that these will work for other slicer/printer combinations: -
---Layer Height=0.2mm, Shells=3, Layer Start Point=Nearest, Extrusion Width=0.46mm
---Infill=10%, Top/Bottom Layers=4, Temp=210C, Bed=65C
---Thin Walls, No supports, Brim if necessary.
Extrusion Width is a particularly critical setting for this basically single skin design and, if problems are encountered, slicer preview is very useful to arrive at the best value.
Single skin prints are particularly sensitive to the stl details, slicer settings and the quality of the 3D printer itself.
In particular retraction settings need to be good, and retractions minimised, to avoid defects in the smoothness of the skin.
Design in Onshape and export stl's
Use Microsoft 3D Builder to re-orientate stl's
Use slicer Ideamaker to produce gcode
Print using Geeetech A10
20/12/18 Middle & Keel Top updated to minimise bridging.
29/12/18 Onshape refined and all stl's re-generated (should be same or almost the same)
9/1/2019 Stern with hatch cut out and new Hatch - good retraction needed. Bow updated.
11/1/2019 Stern & Hatch updated.
12/1/2019 Stern modified to simplify hatch opening and reduce retractions. New Hatch Frame glued into Stern. Revised Hatch.
14/1/2019 Bow, Middle & Stern updated - 0.5mm fillet on bottom C/L
14/1/2019 Hatch & Hatch Frame simplified + Stern to suit. Bow+Middle+Stern=approx 150gm
19/1/2019 All files updated. Successfully printed Bow,Middle,Stern,Hatch(0.1mm),Hatch Frame(0.1mm)
21/1/2019 Stern, Hatch, Hatch Frame updated - easier to print.
22/1/2019 Rudder added - not printed yet.
24/1/2019 Bow, Hatch Frame and Rudder modified.
25/1/2019 All files updated.
27/1/2019 Hatch minor change and new Hatch Knob added
29/1/2019 All files updated.
31/1/2019 Bulb dia increased to 32mm
5/2/2019 Updated Middle and added some Rig parts. RG65 sails are available from Hobbyking at a very reasonable price. They are much bigger than necessary but could probably be cut down to NANO size.
7/2/2019 Added 'Main Sheet Bridge'
9/2/2019 Servo Trays added -suitable for WB4504 6T winch & SG90 rudder servo.
also 'Rudder Top Arm' added. Stern updated.
10/2/2019 Dovetail simplified.
15/2/2019 Bow updated with longer track
26/2/2019 Smaller winch drum and sheet guide added.
ALL PARTS PRINTED ASSEMBLED AND WORKING.
26/2/2019 'Clamp' added - assists when gluing the 'Hatch Frame' into the 'Stern'.
2/3/2019 Bulb redesigned to 'screw' join. Weight = 596gm
12/3/2019 Photos added and all files refreshed.
16/3/2019 Bulb dia reduced to 32mm (553gm) and bulb moved forward 15mm.
21/3/2019 First sail today. Behaved very well but inevitably small leak hence stern modified to include drain hole and TPU bung added. Also bulb position reverted back to 10mm. Slight weather helm so jib position needs to be well forward.
22/3/2019 Minor changes to Middle, Hatch and Hatch Frame
30/3/2019 Bow, Middle, Stern and Hatch Frame updated to increase join width.
Mast moved forward 5mm and Mast Ram added to allow mast aft rake of 0-15mm at top.
10/4/2019 Hatch modified - Stern, Hatch Frame, Hatch and Clamp updated.
Middle modified to accept swing rig bearing.
12/4/2019 Middle modified to accept swing rig bearings.
Stern to Middle join improved - Stern, Middle and Hatch Frame updated.
14/4/2019 Stern, Middle, Bow, Hatch Frame, Hatch, Hatch Clamp, Clamp Top & Bottom updated
5/6/2019 Winch drum improved.
8/6/2019 Superseded by NANO 500 V1 https://www.thingiverse.com/thing:3678421