Printable V8 motor

by sirmakesalot, published

Printable V8 motor by sirmakesalot Aug 17, 2011

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Here is a motor with a v8 configuration. It is two halves mounted ninety degrees from each other with the same crank shaft, connectors and pistons as the four cylinder just more of them. It is worth noting that they can be alternatively mounted flat or opposing piston configuration. I opted for the muscle of the V8!

I have added the crank shaft parts layout and the source file as separate files so if any parts brake, you don't have to print the whole thing again!

UPDATE: I have uploaded the fixed STL files, no more errors from Skeinforge! Thank you all for your valuable input as I am still learning too.

I have added a larger piston file but it requires good printer settings.

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Is there a ratio to an actual motor on any of your designs?

Design pins in sketchup.

Is there any way I can make this without 3mm filament? I use 1.75mm filament.

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Use the file marked v8 layout fixed and V8 body #2 at the bottom of the file list for plate printing. One of the piston blocks wasn't on the build surface so now it is fixxed! Thanks to Thingiverse user JohnA for pointing that out!!
A little tricky to get together and a couple of approaches work so its up to you but here is how I did it. Look at the picture for some reference, the crank shaft is symmetrical and the same one as my 4 cylinder motor and the pistons have room on each mounting rod for two.
The pistons mount to the connectors with 3mm filament.
It helps to put the crank shaft together without the ends that it pivots on first, don't forget to put the pistons on as you go.
Then I put the piston and crank assembly in the cylinders then glued the blocks together. I used Krazy glue but what ever works for you, acetone, hot glue, etc. The cylinder blocks mount on each others end but note their is a rounded corner, I did this for a nice feel in your hand when holding the motor.
Finally I put in the two small rods that the whole thing rotates on and the crank handle.
Your done!


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ncocivi_pw on Apr 6, 2014 said:

Is there a ratio to an actual motor on any of your designs?

Niksko on Mar 26, 2014 said:

Is there any way I can make this without 3mm filament? I use 1.75mm filament.

ncocivi_pw on Apr 6, 2014 said:

Design pins in sketchup.

theevilorverlord on Dec 27, 2013 said:

I printed mine out and it didn't run! WTF...and yes i put gas in!

anvilwyrm on Aug 6, 2012 said:

I have tried to print this on my replicator, but it keeps freezing at ~ line 172888 (over an hour in) for some reason. The printer just stops, for no reason I can determine. the print looks good tp that point, and ReplicatorG still thinks everything is fine, and just waits for the replicator to come back.

I can end the print and print a different thing with no issues.

Any ideas?

sirmakesalot on Aug 6, 2012 said:

That, I am afraid, is beyond my expertise. It could be something with your profile. Perhaps try moving it on the build platform in repG then save and re slice?

I personally haven't had any issues. Most curious.

JohnA on Jul 26, 2012 said:

The v8body fixed file has a tiny, tiny issue. One of the 4 cylinder banks sits .25mm lower than the other....

sirmakesalot on Jul 26, 2012 said:

Hi John,

Here you go! Use the one marked v8 lay out fixed at the bottom of the list. I moved the block onto the build surface. Thanks for pointing that out! :-D

sirmakesalot on Jul 26, 2012 said:

Opps! I'll fix that and reload them today by noon, sorry about that!

yzorg on May 16, 2012 said:

would love to have a starmotor variant of this :)

sirmakesalot on May 17, 2012 said:

I recently uploaded this...


Perhaps this is what you are looking for.

sirmakesalot on Sep 24, 2011 said:

That is strange. Did you move anything around before printing? Is your build platform level? Sounds like the back set prints fine and the front is in the air? This is the first I have heard of this issue regarding the v8 motor. I have recently printed off this in black and green on my TOM and it worked fine. I must admit I am unfamiliar with the Ultimaker so not sure what to suggest.

msmollin on Sep 13, 2011 said:

Ok, I finally have my MK6 built and working (required jumping through hoops with firmware re-compiling because I'm still on Gen3 electronics). Anyone print this with a MK6 on a TOM or Cupcake and use any special settings? Thinking I might want to up my cool time from 10s min/layer.....

Bismar on Aug 24, 2011 said:

Is it just me or are the tolerances between the piston and the engine block unnecessarily large?

Anonymous on Sep 2, 2011 said:

I don't have the MK6 extruder yet so I was happy about the little larger tolerances :)

Still some sticking when turning the crank but I'm sure acetone treatment takes care of that..

sirmakesalot on Aug 24, 2011 said:

Yeah they are a bit. I wanted to make sure that there was enough room. At the time I designed this my machine wasn't as dialed as it is now. I think it could be reduced too however some people have had problems so it might be best to just leave it. It would be worth a try if you like I have posted the source file below.

Disrespective on Aug 22, 2011 said:

Another video. Not as nice as the others, but still shows what clear PLA can do to the model. http://www.youtube.com/watch?v...

sirmakesalot on Aug 22, 2011 said:

Oh man, I love the clear touch of the PLA. Must be cool to put LED lights inside stuff made from it. Have you ever seen clear colours or used a marker to tint it as you print?

nycdesigner on Aug 20, 2011 said:

Better, more colorful version.


Disrespective on Aug 20, 2011 said:

Nice, I was using this print as my first PLA print and am having troubles with the inner face of the cylinders not adhering properly and causing massive stringies when when cleaned up afterwards cause grooves in the cylinder that the piston catches on. I think I need to do more testing... :(

sirmakesalot on Aug 20, 2011 said:

AWESSOOOOOME! Im now thinking about experimenting with clear PLA. When the time comes may I pick your brain?

nycdesigner on Aug 19, 2011 said:

Here's a video of the V8 running.


Disrespective on Aug 19, 2011 said:

Can you provide parts for the cylinders and piston heads separately? I want to try clear cylinders without printing repeat parts.

sirmakesalot on Aug 19, 2011 said:

I have uploaded the pistons and cylinder bodies bellow. Hope it works out, I would love to see a clear one!

NewPerfection on Aug 19, 2011 said:

This is great!

Skeinforge 41 really doesn't like this model though. Some of the cylinders end up with these ridges inside that make the bore too small, and there are weird gaps in between the cylinders and where the cylinder mounts are. Maybe it has something to do with the way Rhino handles STL export.

, this is a very cool model.

sirmakesalot on Aug 20, 2011 said:

I fixed all the STL files if you want to try again.

sirmakesalot on Aug 19, 2011 said:

Might be your settings in Skeinforge. I had the same problem but not as bad as what you are experiencing. I had what appeared to be some cylinders overlapping but only by a small amount. I sanded them off. Try a layer thickness of .3 mm and turn on the reverse option with about 75-78ms and infill to 100%.

I know rhino could be the issue.

msmollin on Aug 19, 2011 said:

Awesome work sirmakesalot! Got a question... RepG is putting out a lot of errors when slicing layout2 that look like:

[22:33:38] Warning, the triangle mesh slice intersects itself in getLoopsFromCorrectMesh in trianglemesh.
[22:33:38] Something will still be printed, but there is no guarantee that it will be the correct shape.
[22:33:38] Once the gcode is saved, you should check over the layer with a z of:
:38] 2.62499775513

Any ideas what could be causing that? I'm trying to print on a Cupcake if that helps at all?

sirmakesalot on Aug 19, 2011 said:

Thanks very much!

I have been getting the same error message with this and some of my other prints from Skeinforge 40 but It still prints out ok for me and with other prints just fine as well.

As best I can tell it may have something to do with the program I am using to draw this with and it isn't translating well, (I am using Rhino if you are familiar with it, I put the source file below) I am still fairly new to this stuff so I am not too sure and as for the cupcake thing I would think it doesn't matter should print just the same.

Have you checked the Skeinforge wiki? Might be something there and what happens when you print?

Let me know how it turns out!

nycdesigner on Aug 19, 2011 said:

My wife, Nanci Ezzo, is the driver ;-)

nycdesigner on Aug 19, 2011 said:

P.S. This was one of the funnest "things" I've made with my TOM to date!

pchretien on Aug 18, 2011 said:

Great job !! What are you using to draw these? Would be nice to get the sources so we can play with it ... Thanks for sharing!

sirmakesalot on Aug 19, 2011 said:

I have added the source file for you, have fun!

sirmakesalot on Aug 18, 2011 said:

Thanks! I use Rhinoceros 4.0 NURBS modeling for windows. I will upload the source file for all my motor models for people to play with this eve!

Thaed on Aug 18, 2011 said:

When are you going to get serious and print one that fires? LOL. Awesome work!

woofpickle on Aug 18, 2011 said:

Or one that runs off of air...

Ben on Aug 18, 2011 said:

next step is a v12? thanks

relet on Aug 18, 2011 said:

No, next step is a parametric motor in arbitrary configurations and angles.

SamDaMan on Aug 18, 2011 said:

Another great upload! I've just started the print for your 4 cylinder! Did you print it with an ABS raft? :-D

sirmakesalot on Aug 18, 2011 said:

I printed this raft-less with ABS.

scooter46290 on Aug 18, 2011 said:

Great stuff. Can you make a fully printable sterling motor? Thanks for the cool designs and inspiration to make more things.

sirmakesalot on Aug 18, 2011 said:

Thanks for the compliment. I am working on a hula motor now, it's turning out to be way more challenging to make it printable.