I am trying to locate where Franks coupler drawing files are. Can anyone point me in the right direction? They used to be on his website, but I cannot find them anymore. Stephen

Thanks Al. Right now I'm just experimenting to see what will work and what won't. Hopefully we can all pool our knowledge and experience in order to give us a way to enjoy these couplers that are no

Kevin, The couplers sure do look good all painted up! still think an ad in RMC or Model Railroader might attract interest. thought about emailing Exact Rail or Tangent or both. Al Hummel

Type F prints! They printed just fine, but I didn't get Frank's message about not using supports until they were already in the printer. Next test batch will be with Blu and no supports. I again

Kevin: Thanks for confirming that your parts were HO scale ... detail and finish is amazing for such a small scale. My friend printed the first test parts (S scale top and bottom ... no knuckles,

I've heard that the Siraya Blue is better, but even better is a mix of Siraya Blue and a reason called "Tenacious" ... two suggestions were 80:20 Blue:Tenacious and 50:50 Blue:Tenacious. I don't have

Mike - Yes, resin printer. Elegoo Mars SLA printer with plain Elegoo Gray resin. Good detail from that resin, but definitely not the strongest out there. -Kevin

Frank - Wow, those pictures are awesome. It all makes more sense now how you designed them. When you printed the initial models, what orientation did you have them in? Vertical? Horizontal? In

Tom - Yes, these are HO scale. I did not make any adjustments on the 3D file because I wanted to see if they would print first. The two holes I described ended up printing slightly small, and I feel

Frank, are those couplers shown 3D printed in wax for lost wax casting? And Kevin, great work, did you do that on a resin printer? If so, which resin did you use? Mike Conder

Hey Kevin, looks like you are getting very close. Go look at the pictures in the sergent engineering groupsio page “Treeing 3D prints”. Look at the IMG_1095.jpg picture. All the 3D models are

Kevin: Very nice work !!! Thank you for sharing your experiments / results ... really look forward to hearing results from operating. I'm guessing these are HO scale couplers? What size ball was

Jeff - I did use dry graphite when I put the ball in, and it helped. The knuckle could certainly use some of it. I'll give that a shot on the next set I assemble. -Kevin

Sounds great, Kevin. These couplers look fantastic! -- Ryan Harris Fort Worth, Texas

KevinThat’s pretty Amazing. Rob B

Hi Kevin, Try lubricating the plastic with graphite and see if the knuckle moves more easily. (Just shade it with a pencil if you don’t have powdered graphite.) Cheers, Jeff.

Very nice Kevin!! Very interested to see how this works out as I also missed the boat on them when Sergent was producing them! Thank you, Keith

Kevin do please let us know how this goes. If you could do this for double shelf and type Fs as well that'd be awesome.

This looks very promising. Thanks for moving forward with this. George Sebastian-Coleman gsebastiancoleman@...

Bill - yes, the shank portion of the coupler is the same for either version. Just choose which lower you want to put on there.....lower shelf, or normal. Both of those parts are still made by Sergent