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Building a HevORT, 615mm x 615mm x 890mm build volume, specifically for making HPR parts. Just getting started, hoping to have it printing by Christmas. Here's me sitting inside the build chamber - going to have a 19" wide bay to the right that has a dry box and a full up computer/keyboard/17"...

Hi everyone, Currently 16 or so hours into an 80+ hour print. Thunderstorms approaching so I'm getting nervous...maybe 1 in 4 storms causes our power to at least "blip", 1 in 10 lose it for awhile. I've been looking into UPS's, but the runtime on something like that would be an hour or two at...

Hi everyone, Having a bear of a time getting PETG to work right coming off of the spool. If I dry it per the manufacturer's instructions (65°C for 5 hours), when I get about halfway thru the spool the filament sticks to itself and breaks off. I tried drying it for longer at a lower temp (50°C...

Hi everyone, What do people think of the Berd air system? Seemed kinda neat to me so I picked up a kit. Seems to work really well...first print going now, so that's kinda TBD. I had heard complaints about how loud it was...it's way quieter than the original "non silent" steppers that my...

Hi everyone, I need to do some fiberglassing in my basement where it's a solid 68*F. For structural epoxy I use T-88 for a wide variety of reasons...one of which is that it'll cure up as reduced temps. For laminating, all of used is Aeropoxy, which claims to be RT cure but I've never had it...

Hi everyone, I'm working on another rocket with a 3D printed fincan/motor mount. I launched on a J450 last year without issue, and am aiming for a similar flight on a K535 at Mini Midwest Power in May on that same rocket....assuming that goes well, the build on this thread will be the next...

I've spent a lot of time dialing in things to be perfect with my printer...except for when I forgot to put on a part cooling fan on my custom mount. So I plugged one in, let it kinda dangle there by the wire till it came to rest, and then I hot glued it in place. Did all of this while the...

I've seen many people doing thrust vector control. Totally awesome, but limited to lower powered motors. I've seen people (Jim Jarvis's 3 stager comes to mind) that use a computer to control aerodynamic control surfaces. Are these devices home brew? Or is there someone out there making a...

Hi everyone, In the super early planning stages for an air start rocket (my first, hence the question). How do people hold the ignitor up inside the motor? I've heard of small dowels being used - how are those supported? If I had to try something on my own, I would say the smallest...

Hi everyone, Looking at getting a 2S LiPo setup for my Eggtimers. I've found some small 1S battery cells that would be perfect if I put 2 in series. Can this be done with individual LiPo's? I know that when you charge multiple cell LiPos you have to have some sort of balancing circuit or...

Hi everyone, I was printing a tailcone and had the print fail. I've used a technique a couple of times in a case like this to bond two prints together, and it's worked well, so I figured I'd share. Here's the part after the failed print, slightly sanded to remove some gunk from the top: I...

Hi everyone, I built and flew the rocket I called "Basket Case" at Mini-Midwest Power last year. It was the furthest up the power ladder I've gotten into 3D printing, a dual-deploy 3" that flew on a J450DM (pics below). The thread for that one was here...

Hi everyone, I've flown a LOT with Matterhackers Tough PLA (up to a monolithic fincan/motormount that flew with a J450). Great stuff, but crazy at $52/kg. I wanted to find something usable and cheaper. I know the owner of GreenGate3D (USA extruded recycled PETG filament), so he gave me a...

Hi everyone, Just started my L3 build, figured I'd post here. This is going to be a pretty "standard" build, building a LOC Bruiser EXP. Current plan is to fly it on an AT L1000W for a shakedown flight, then an AT M1350W at Midwest Power at the end of October for the cert. Between now and...

Hi everyone, I've been flying 3D printed fincans and nosecones and whatnot, slowly working my way up the power ladder. Memorial day weekend, I flew a J450DM with a printed monolithic fincan/MMT with zero issues (see pic below). I want to switch filaments from what I have been flying (~$60/kg...

Hi everyone, I know there's a rule in place saying that any M or larger rocket with a 3D printed fincan needs to have fiber reinforcement...or something like that? I just went through the safety/rules section on the Tripoli website and can't find anything about it in terms of specifics. Does...

Hi everyone, Just wanted to alert everyone to the fact that there's a pretty amazing grassroots movement right now to manufacture PPE at the local/individual level for hospitals to help respond to Covid-19. There are people out there sewing disposable facemasks, things like that. I just...

Hi everyone, Working on a new build that some people might find entertaining. I ordered some dowels from McMaster and got one of those thick-walled shipping tubes, decided to turn it into a rocket because why not? (OK, yes, the "why not" is that the tube is 10x's thicker than needed and is...

Hi everyone, Some quick background - I've never launched a rocket powered glider, but have an interest in all things rocket and airplane, so it's a nice mix. All of the glider launches or pictures I've seen are a full up glider with a rocket motor strapped to it, which would have some...

Everyone, I am assembling my first av bay in a decade and have some questions. Please see attached pic... Are these terminal blocks reliable? My worry is vibration loosening the screws and causing a broken connection. My thought was to use lock washers and ring terminals with any wires...