Toronto Electric Model Aviation Club Forum

Toronto Electric Model Aviation Club (TEMAC) => Building / Construction => Topic started by: davidk on March 23, 2021, 11:09:26 PM

Title: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 23, 2021, 11:09:26 PM
This is a 3D printed plane from PlanePrint.com, the Big Bobber.  It's a bigger version of their Savage Bobber which is based on the real Zlin Savage Bobber.  The Big Bobber is 54", 1400g, 3S or 4S.  This is my first project in 3D printing.

Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 23, 2021, 11:19:54 PM
The cowl section is glued in place with tabs joining the fuselage.
The frame starts building once the 3 main fuselage parts are together.
There's a guide tool that is printed which helps align the frame fuselage sections for gluing.  Medium CA is used with Kicker.
The Tail sections are put together and start attaching to the rear frame.
3 frame supports are put in place strengthening and aligning the structure.

Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Michael on March 24, 2021, 09:58:45 AM
It's really interesting.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: sihinch on March 24, 2021, 10:05:47 AM
Super cool David!  Looks really nice. Congrats.

I'm excited to see it finished and flying.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Frank v B on March 24, 2021, 06:33:47 PM
David,

Looks neat.  Love the colour changes with the red and black.

May I remind you of a 3D presentation done by one of our members, Gil Elgez, a few years ago at a Pilots Meeting.
He advised us that before you start investing in 3D technology for model building, you should first check the status of your marriage.  3D printing eats hours and dollars.   ;D ;D

Frank
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 24, 2021, 11:06:44 PM
Add 6mm Carbon Fiber Tubes and Wing1 parts Left and Right.
Turn it upside down and align the Horizontal Stab to the wing... then tape the stab to the table and glue the rear frame.  I messed this up... the tape loosened and I didn't notice.  That's what trim is for... I hope.
Then straighten the horizontal stab to the wing and tape it... over tape it.  This time it stayed... and glue in cross bars throughout the frame.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 25, 2021, 12:05:57 AM
The Wings and Fuselage... most of the plane... is printed with PLA.
The hinges are printed with TPU filament, which is flexible.  There are varying degrees of flexibility.  You can get filament that is more... or less... flexible... and you can print with more or less infill to get the flexibility needed.
The original Bobber has a manual trim on the left side of the elevator.  PlanePrint has added that detail to this plane, although it's not functional.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Andy Hoffer on March 25, 2021, 08:33:23 AM
Elegant structure Dave.  Could you tell us how long the pieces take to print, how much material is typically used on a p[roject of this size and the cost to print everything.  (Can you print money with a 3D printer?  8) )

Way to go.  Looking forward to seeing the completed plane.

Andy



Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 25, 2021, 11:28:03 AM
Each of the 3 main wing pieces (6 in total) took about 7 hours each... they are the longest.  Total print time around 100 hours.  With the filament I'm using, 1 wing part costs about $2.00 and takes 61g or 20m of filament.
You can't print money, but you can print chocolate or carbon fiber.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Andy Hoffer on March 25, 2021, 09:07:33 PM
Each of the 3 main wing pieces (6 in total) took about 7 hours each... they are the longest.  Total print time around 100 hours.  With the filament I'm using, 1 wing part costs about $2.00 and takes 61g or 20m of filament.
You can't print money, but you can print chocolate or carbon fiber.

So, you can print a chocolate Easter bunny pilot bust!! What a great technology!  :D

Andy
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 26, 2021, 01:13:31 AM
Start of the landing gear.
The tires are printed with ColorFabb VarioShore TPU.  This flexible filament can be printed in a range of temperatures from 200C to 250C.  This range dictates how much the filament will expand and foam.  This results in a variety of soft, flexible material.  The tires are squishy, but not too much.  One of the pics shows the grid infill pattern with a density of 8%.  The pattern and density can be changed resulting in a harder or softer tire.
3mm CF rods reinforce the fairings.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 27, 2021, 12:31:48 AM
Landing gear attached.  Standard Cub style with the pieces printed out of a flexible TPU filament.  One part on the fuselage, and another on the wheel.  These are normally held together with elastics giving the gear some flex for landing.  However, another Bobber printer created these flexible TPU bands for the gear.
The rear wheel is also mostly flexible TPU... and the landing gear is done.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Andy Hoffer on March 27, 2021, 05:32:42 AM
Nice job @davidk .  Your photos are very clear and well lit.

My Spidey sense is tingling and telling me that watching this seductive build thread is going to cost me money!  ::)

Andy
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Michael on March 27, 2021, 08:06:23 AM
This is a fascinating build.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 27, 2021, 05:51:38 PM
Now for the wings.  This is the part where I was a bit nervous.  Each wing part took about 7 hours to print.  Now, that's printer time, not my time, but still.  However, I practiced what I wanted to do and, although I almost glued one wing to the table top, it came out pretty good.  With the wings on, it looks like a plane.
In one wing section image you can see the connectors which get the glue.  These fit into another wing section and there is very little play... but you still need to ensure they're aligned nicely.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Andy Hoffer on March 27, 2021, 06:28:17 PM
Beautiful @davidk !  I see you printed yourself a nice pair of frames for your glasses.  You should add some nice aircraft logos to the temples.  Rob Dickinson ( @octagon ) will be SO envious!! 8)

Andy
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Michael on March 27, 2021, 06:31:40 PM
The model looks fantastic!

The wings are cool!
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: GuyOReilly on March 27, 2021, 06:49:43 PM
WOW!!!
Looking great!
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 28, 2021, 01:40:20 AM
The Ailerons and Flaps each come in two pieces, joined by 1 connector and glued together.
Then, TPU hinges are used to attach them to the wing.  The wings are done.  The ribbing is subtle, but looks great.
Next... electronics.

Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: Frank v B on March 28, 2021, 09:01:36 AM
What a neat technology.... properly shepherded by Mr. Kates.
If you could have described and shown this technology to someone in the '50's and '60's they would have checked you into the psychiatric ward. :)

Frank
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 28, 2021, 01:19:22 PM
Electronics are going in.  PlanePrint gives you 3 choices for Servos... you print the specific Servo housings for the ones you choose.
Motor mount is printed in PLA.  These could be printed in PETG for better strength and heat resistance, but in this case it's a standard metal X bracket directly on the motor, which screws into these motor mounts.  The mounts are far enough away from the motor so heat shouldn't be a problem.  In some printed planes, the motor is screwed directly into a printed motor mount.  However, these are usually replaced with wood... just in case.
Title: Re: Big Bobber PlanePrint 3D Printed Build
Post by: davidk on March 29, 2021, 11:38:12 PM
Motor and ESC are in and the motor cover is glued together and then screwed into place.
Elevator and Rudder Servos go into a servo tray that is then screwed into the fuselage.  There is space for 3 servos, one of those being for a tow coupling.  I'm not putting that one in.
1.5mm CF rods move through guide holes in the frame.
The wing servo locations have support material that need to be cut away.  I used a hot knife and then cleaned up with a sharp blade.  The wings have printed tubes in the frame for wiring.
The Ailerons are taped to the wing tip and the Flaps are taped to the Ailerons... all nice and straight.  1mm wire is used for the wing servo connecting rods.