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Post  Jason_WI on Sat Jan 19, 2019 11:47 pm

Finally took the time to draw up the postage stamp mount that was available back in the day.

I need to use a .25mm nozzle on the 3D printer to get better detail. This was printed with a .4mm nozzle with a .2mm layer height in clear PETG. Once I have the dimensions dialed in I’ll try a run in zytel or glass filled nylon.

Took 20 minutes to print. Used support on the overhang. I used solid fillets in the design vs the thin individual ones. Easier to print this way.

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Post  NEW222 on Sat Jan 19, 2019 11:51 pm

Good job Jason. They look great.
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Post  Jason_WI on Sun Jan 20, 2019 12:21 am

Forgot I had a crusty postage stamp engine with me. Here is the 3D printed version installed on an engine.

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Post  Admin on Sun Jan 20, 2019 1:03 am

Looks good! When are they going to go on sale? Very Happy

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Post  NEW222 on Sun Jan 20, 2019 1:40 am

One sure couldn't ask for anything better.
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Post  Jason_WI on Sun Jan 20, 2019 2:46 am

Made the spray bar slot wider. The version of the mount I have the slot isn’t wide enough to install without removing the spray at from the postage stamp backplate. Removing these spray bars sometimes destroys the postage stamp mount.

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Post  getback on Sun Jan 20, 2019 7:12 am

The prototype looks good Jason , when cleaned up will make good display or runner !! Good to see your advancing in the hobby lol! This Site Rocks!
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Post  Jason_WI on Sun Jan 20, 2019 3:13 pm

Printed 6 in 2:15 minutes. This is the updated version with the wider opening for the spraybar.


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Post  Cribbs74 on Sun Jan 20, 2019 3:34 pm

The Goldberg version is a tight fit around the spraybar so your modifications should make it much easier.
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Post  roddie on Sun Jan 20, 2019 4:27 pm

Hi Jason, Those mounts look terrific! Were those printed with the higher-res. .25mm nozzle? If so; can you print the aforementioned zytel or glass-filled nylon materials using that nozzle?
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Post  Jason_WI on Sun Jan 20, 2019 4:51 pm

These are still with a .4mm nozzle. I wanted to send a few out for testing before I run a batch in nylon. The fit will still be tight on the spray bar with these. A flat file or trimmed with xacto knife to adjust the fit.

If I remove any more material then might as well print in 2 halves. I have seen these cut before. Or cut them for installation.
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Post  GallopingGhostler on Sun Jan 20, 2019 5:00 pm

Jason_WI wrote:Printed 6 in 2:15 minutes. This is the updated version with the wider opening for the spraybar.
Nice going Jason, never dawned on me sleep 3D had an application for this type of use, but it looks really good, practical. Very Happy AFAIK regarding needing a wider opening, the trick to yours was to carefully pop off the nylon tube needle retainer, then it would fit. I have the earlier spring retainer version and it fits the CG mount without problems, probably was the design basis for the mount.

With additional Sure Start backs and modified for Killer Bee backs made the mount unnecessary, but with those who still have the postage stamp back, yours is certainly a good up-to-date option. Thumbs Up
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Post  jarboy on Mon Jan 21, 2019 2:04 pm

I am unfamiliar with the strength of these printed materials, how do they compare to original style plastic parts?
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Post  Marleysky on Mon Jan 21, 2019 10:13 pm

Jason_WI wrote:These are still with a .4mm nozzle. I wanted to send a few out for testing before I run a batch in nylon. The fit will still be tight on the spray bar with these. A flat file or trimmed with xacto knife to adjust the fit.

If I remove any more material then might as well print in 2 halves. I have seen these cut before. Or cut them for installation.


Oh, oh, now that I’m no longer in school, ILike Tests! Pm me with cost and paypal for a test bed model!!
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Post  batjac on Mon Jan 21, 2019 10:55 pm

Well, I have a plane set up for the postage stamp with the Goldberg mount. If you want one tested to destruction (as all my planes are), I'll give it a go.

The MXC Elimination Challenge Mark
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Post  Jason_WI on Tue Jan 22, 2019 1:00 am

jarboy wrote:I am unfamiliar with the strength of these printed materials, how do they compare to original style plastic parts?

With nylon or nylon with carbon fiber it should be just as strong as a molded part. Special requirements are needed to successfully print with nylon. The filament must be dried or baked prior to printing to eliminate moisture. Moisture in the filament will weaken layer adhesion. I use a continuous filament dryer while printing nylon.
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Post  getback on Tue Jan 22, 2019 4:14 pm

Shoot i will test one if you like i would like to see if i can run a postage stamp up to 20K I Love This Forum!
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Post  Jason_WI on Wed Jan 23, 2019 5:27 pm

Printed a few with the .25mm nozzle at .1mm layer height. Much better detail captured with these prints. This is still clear PETG.

I need to run the next batch out of nylon.


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Post  NEW222 on Wed Jan 23, 2019 6:19 pm

Simply amazing Jason. Those look very well made. It is amazing what one can do in their own home now-a-days. But I have to ask. How long does it take to draw something like that up? Or even better, if someone with little knowledge of 3d printing like myself how long would such an endevour roughly take? Seeing your work make me think more and more.
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Post  Jason_WI on Thu Jan 24, 2019 12:59 am

It didnt take very long to draw up in tinkercad. I went from design to holding an actual part hot off the 3D printer in my hand in about an hour.

Tinkercad is pretty easy to use and it’s online based. Just sign up for an account.
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Post  Cribbs74 on Thu Jan 24, 2019 11:06 am

Looks pretty good. Will the PETG stand up to nitro or is that why you are going with Nylon on the next run?
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Post  Jason_WI on Thu Jan 24, 2019 4:07 pm

PETG will break down with nitro. See the chemical resistance chart for PETG.

https://docs.google.com/viewerng/viewer?url=http://3dfilaprint.com/wp-content/uploads/2014/05/Chemical-Resistance-Chart-Detail-PETT-or-PETG.pdf&hl=en_GB

Zytel will handle gasoline with alcohol and diesel fuel. I couldn’t find a reference to nitromethane.
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Post  Jason_WI on Sun Jan 27, 2019 5:18 pm

Here they are in DuPont Zytel.

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Post  NEW222 on Sun Jan 27, 2019 6:34 pm

Looks great. So after printing, do you have to let it cool for a bit before handling and or use it so it cures, or is it good to go right off the printer? Just wondering as this is kind of a structural part for mounting.
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Post  Jason_WI on Sun Jan 27, 2019 6:55 pm

I wait for the bed to cool down a bit before attempting to remove. Removing warm parts can distort them. The bed the print sits on is at 110C. The nozzle temperature for nylon is 270C. The nylon is molten and hardens fairly quickly. If you print small features and only of one part the part can turn into a molten blob. That’s why I like to print multiple parts of one item so it gives the fresh layer time to cool.

PLA filament needs a cooling fan enabled. No fan with nylon or separation between layers can occurs. Ideally my printer should be in a heated chamber for best results with nylon or ABS.

I will soak the nylon parts in water for a day then they will be pliable. Fresh off the printer they are hard and brittle.
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