I’ve tried three things, heat gun on the part itself and seat it on the shaft of the motor, or heat the shaft and seat the part.
The last and most effective was to preheat the shaft (mildly), then heat the part. Otherwise the temperature of the shaft will rapidly cool the part down. That seemed to be the best approach to getting this on ‘permanently’… I haven’t been able to remove one of these without breaking them.
Reprinted in NylonG and playing around with a polycarbonate mount.
(This sounds pretty cool in person; it’s much more deep and grumbly than the PLA :D)
Think I’ll need to buy/cnc a mount plate – plastics just don’t seem like they’re stable enough under stress. I suppose if you had cross bars to a second mount, it might be ok, but…
A longer motor shaft allowing for a thicker mount might also help.
My biggest problem at the moment is that I can’t put in the front two motor screws – the main gear is in the way, and I can secure them ahead of time, or you can’t slide the main gear into place – unlike with a regular gear setup you could kinda “wiggle” it in, the herringbone pattern doesn’t allow for that at all.
As you said, the mount vibrates like a horse tail all day, so a 5mm alu plate as a min.
How is that drive going? One of the things that will lower the barrier for entry into DIY drivetrain is to also print the mount arm like you are doing there. (instead of taking an existing metal arm from another drivetrain)
Seems like the community is getting close to making a 3d printed drivetrain.
Has anyone used this filament or just their regular polycarbonate? I’m getting both in the mail tomorrow for a printed deck, but once I finish that I’d like to print my own gearbox. I don’t have a setup to test gears on though, so if one of you guys that’s testing wants me to print a gear or mount and ship it to them I would love it.
Let me know how that CF stuff goes. I’ve had my eye on that for a while.
I’ve got both filaments but Monday I get a hardened nozzle so I can print the CF. The regular black PC is definitely a blend with PETG but that makes it easier to print with I think and it’s still stronger than regular PETG too. I’m going to use the regular PC for a deck along with CF rolled tubes, then if the CF filament works well, that’ll be my gearbox.
Awesome. I ordered a bunch of upgrades for my printer, so once they arrive, I might try nylon, etc.
Hopefully a decent working gear drive gets uploaded somewhere at some point, cause I sure as heck can’t design anything like that 
Hey @chuyskywalker it looks like you’ve got a nice setup for testing a printed gearbox. I’m going to build a 3D printed planetary gearbox with CF filled PC in the next couple weeks but like I said before I don’t have anything to test with right now. Would you be interested in testing one out for me (on the bench and if it works, riding) if I design it to your specs? I’m eventually trying to build it for 12mm trampa/mbs axles but for this first iteration I could easily adjust for your 3/8" trampa axles. Also if you’re not interested, I’m looking for anyone who could give me quick feedback on a running setup.
Edit: Forgot this isn’t just a US sub. Right now only looking to ship in the US.
If it’s chopped CF I would expect low performance. I’ve used some budget friendly options like priline CF PC and found it to be fairly weak when it comes to layer adhesion.
Carbon fiber stranding tends to build tensile strength but has limitations. The carbon also acts as a bonding preventer as the space in occupied does not allow PC to PC fusing between layers. Chopped CF additives can be stronger but only under certain loads.
The carbon is also going to act as an abrasive. So that’s something to consider
I would not recommend CF filament either. I used it for htd5m wheel pulleys and they worn out quicker than I expected…
would definitely recommend nylon for this application!
What type of CF filament though? This is Polycarbonate based not PLA based. I’m going nylon if this doesn’t work, but this filament seems really tough.
Thanks for the info. I’m using the Priline CF PC and so far layer adhesion seems to be really good, although I could also try the Priline PC if the carbon fiber causes abrasion/layer adhesion issues.
PC won’t help much, maybe with grease. Nylon will need minimal grease. I plan to try taulman at some point.
The priline is tough, prints beautifully but it was weaker than expected across layer lines for me. They’re also not very forthcoming with what the makeup of the filament is, it’s not just pc
I think it probably has some PETG in it but I don’t think there’s any 100% PC filaments available. I’m going to try it with what I’ve got for now and switch to nylon if it doesn’t work. Nylon is pretty spendy so I was avoiding it for my deck, but maybe I’ll order some for the gears. I just found this Nylon that looks interesting especially for the price, might give it a shot.
I believe, mine was petg based. But I have to check to make sure.
Wow what a nice innovative group:+1:
Had my first rides yesterday sone steep hills up and down with breaking tests.
I needed to glue the motor mounts to the axle with kbweld because there was little movement at breaking hard which caused the cans to get pushed towards the trampa trucks => the cans touched the trucks slightly
After gluing them on and fastening the adjustment screws again theres absolutely no wobble any more
Its holding up so far im really impressed
As you can see its not fully 3d printed as the motor pulley is made out of steel
image
The gear ratio is 12/30 => 1/2.5 with 107mm flywheels
The gears are printed out of polymide(80% infill) and the housing is made out of carbon nylon CF15 (50% infill)
anybody knows how i can make the vid running?
Love your desing, after 130 days of quarantine, i wish to have your files to try them on within the future (maybe on 2030 if my fuck@##@n goverment keep all of us in house arrest…) If you share, I print…I have trampa trucks, tb trucks. independent truchs, mbs trucks…and so on…other than that, you are doing an amazing job…
thx very much man!!
ill test them little bit longer and if it holds up ill share them.
one thin i need to point out is tht my motor shaft has been made longer as to ensure strength of the motor mounn i needed to print it thicker => shaft needed to be longer
Do you know how i can post a video?
i tried before but its not working to play it
