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I happened upon these videos today and thought the technique that the guy uses to support large unsupported spans is pretty clever. The first video shows the technique and the second one takes it a step further. Randy

We've had three Golden Retrievers in our family. We had one when the kids were growing up, and now each of them has their own. Love Goldens. Luckily we get to watch our grandpups a lot. Randy

I've been working on a simple, easy to print beginner rocket for the grandkids. BT-55 and about 19-1/2" tall. 3D printed fin can and nose cone, replaceable kevlar shock cord, screw on 18mm motor retainer. The BT-20 motor tube runs all the way through the fin can so I have a shot at the fin can...

OMG, I can't believe someone mentioned this. I also watched channel 17 from Philly when I was young and the 8th Man episode with the nuclear witch scared the heck outa me. I didn't think there was anyone else who even remembered that. My favorite was Astro Boy and that show is probably the...

Good data point. About how long are your lugs typically? Randy

I thought of the Maniac when I posted this. I had one years ago. I was thinking that it only used the fin can lug but when I looked up the manual online, it showed an upper lug mounted to the body tube. I'll try the new model with just the lower lug and see how it works. Randy

It will be about 1 to 2 inches ahead of the top of the fin can. Randy

Guys, I'm wrapping up the design of a rocket for the grandkids and was wondering what you guys think of the current launch lug configuration. The launch lug is part of the fin can (3D printed) and is 4 inches long. The overall length of the model is 21 inches. Do you think I can get away...

A little more info on the Bertha/Fat Boy nose cones here. Randy

Check out Paul Trainer's videos: Vid 1 Vid 2 Vid 3 Randy

I've never had an issue with PLA sticking to the textured PEI plate. I've always been amazed at how well it sticks when it's hot and how it just lifts right off after it's cooled. I do keep my plate clean by washing it with dishwashing liquid (Dawn) every now and then. Randy

Search for "3 fin jig - modified" and copy that. I added rounded corners. If you don't want them, just exclude them from the extrude. Randy

Were you able to modify it the way you want? If not, I can help you out. In the image below, I widened the ends a bit. Let me know if this is what you're looking for. Randy

Here's a good exaggerated example of what input shaping does. Randy

We stopped at the Katz's Deli in Connecticut on our way up to our son's yesterday. The line was always too long at the NYC one when our daughter lived there. The pastrami was a religious experience. 😀 Randy

If you want to go Ender 3, take a look at the latest, the Ender 3 V3 SE. Here is a YT review. $199 and it has auto bed leveling and auto Z offset. Auto Z offset is a big deal. Makes it pretty close to fire and forget. Randy

Not rocketry related but hobby/toy related. My grandkids are into Brio wooden trains lately. I found a flexible version of Brio track on Thingiverse. It was ok, but I decided to re-CAD it and make it a little better looking, more flexible, and better fitting. Here are some pics of my test...

What brand do you use where PETG is that high and ABS is that low? For the ones that I use, ABS is typically about 15-20C better than PETG when it comes to heat deformation temperature. Randy

One advantage that a CoreXY has over a cartesian is that the input shaping that's required stays consistent over the entirety of the print. With a cartesian, as the print builds, the Y axis mass increases so theoretically the input shaping should be adjusted as the print proceeds. Randy

Here ya go... Randy