this post was submitted on 27 Mar 2024
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Any tips on printing lego parts? (lemmy.world)
submitted 7 months ago by JoShmoe@lemmy.world to c/3dprinting@lemmy.world
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I am using OrcaSlicer/BambuStudio with the P1P. Also, the hotend currently has hardened steel gears and a 0.8mm nozzle.

Am I forced to print the lego pieces slowly? Is there a setting or function that I can tweak to slow down my printer when it reaches the tiny circular geometry?

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[–] surfrock66@lemmy.world 25 points 7 months ago (1 children)

Lego parts are incredibly precise, and the manufacturing tolerances have been consistent for decades. It's nearly impossible to replicate that precision on any modern printers.

That being said, different parts are more tolerant of wiggle room. Grabbing a stud is hard, grabbing a 2x4 is not. If you were going to print a minifig head, trying to replicate the neck barrel is gonna be tough, but making a larger hole with 2-3 ridges which taper to grip might be easier. If you plan what you're doing and are realistic about what you can print, it's definitely not out of the question.

Lego is ABS if I'm correct.

[–] JoShmoe@lemmy.world 4 points 7 months ago

Yeah I hadn't thought about getting the smaller bits off the plate.

[–] _haha_oh_wow_@sh.itjust.works 7 points 7 months ago* (last edited 7 months ago) (1 children)

My only advice is that it's not worth the hassle. If you really want to though, yeah, slower is probably better.

[–] JoShmoe@lemmy.world 3 points 7 months ago (2 children)

You might be right about that. Still being able to print at that quality or near it, would look good.

[–] littlebluespark@lemmy.world 8 points 7 months ago (1 children)

Resin, 100%, is your solution. Not FDM.

[–] _haha_oh_wow_@sh.itjust.works 1 points 7 months ago (2 children)

As great as it is at detail, even resin won't be perfect. Plus it won't last if you use it because of the nature of resin.

[–] littlebluespark@lemmy.world 2 points 7 months ago (1 children)

Perfection is an illusion.

[–] _haha_oh_wow_@sh.itjust.works 4 points 7 months ago* (last edited 7 months ago) (1 children)

Sure but Lego's ridiculous tolerances are very real (and very impressive if you ask me).

[–] littlebluespark@lemmy.world 1 points 7 months ago (1 children)

While I'm also impressed at LEGO for that reason among others, printing in resin is the only way to make proxies even remotely viable — even if such will be fractions of a millimeter off from originals. 🤘🏽

[–] _haha_oh_wow_@sh.itjust.works 3 points 7 months ago (1 children)

You could probably get good results with something like sintering too but good luck affording that setup lol. FDM might be able to get close but it would take a lot of work to get and keep it there.

IMO, if you didn't care about pairing with actual Legos, printing a mold might be the way to go (especially if you wanted to make a bunch).

If you wanted to just have something that looked like a Lego brick and you didn't plan to repeatedly build/rebuild, resin would definitely be the way to go though. I don't think resin would stand up to regular use though.

[–] littlebluespark@lemmy.world 2 points 7 months ago

Choose your resin carefully and add 10-20% Tenacious, FTW.

[–] JoShmoe@lemmy.world 2 points 6 months ago

I had assumed they were referring to pouring and not a resin printer. Using a mold is definitely a full proof approach.

[–] _haha_oh_wow_@sh.itjust.works 2 points 7 months ago

Absolutely, but even when it looks perfect, it still won't match the tolerances of actual Lego pieces so it won't function as well if at all. They're super meticulous about that stuff and amazing at it especially for a toy company!

[–] Drummyralf@lemmy.world 7 points 7 months ago (3 children)

Unless you have free power and filament, wouldn't it be cheaper to buy specific Lego bricks?

Unless it's just for the heck of it obviously. Then print away :p.

[–] Fribbtastic@lemmy.world 5 points 7 months ago* (last edited 7 months ago) (1 children)

Depends. I recently was in that situation and it was easier and more cost-effective to just print them.

I recently bought some Lego Star Wars sets and printed out some Display stands for them but the connection between the stands and the model was expected to be a 2x4 Lego plate. I didn't have those plates at hand so I looked online and found it from the official Lego site.

The individual "Plate 2x4" would cost 0.14EUR each. Since I needed 3 this would be 0.42EUR. But the mailing costs would be over 9EUR.

So ordering 3 of those Lego pieces would cost me almost 10 bucks. I just printed them out which worked well, they were a bit tight fit but are still holding.

But I wouldn't necessarily say that this is a replacement for actual Lego pieces. As a quick alternative that you can't see or that has less interaction with other pieces (doesn't need to fit correctly on all sides) then I think this can work.

[–] ShepherdPie@midwest.social 3 points 7 months ago

My next step in between buying from Lego and printing would be Bricklink or a second-hand Lego brick and mortar store like Bricks & Minifigs. Printing can get the job done and probably works fine for a display stand or similar, but you'll never get the tolerances needed to match Lego out of a consumer 3D printer.

[–] EmoDuck@sh.itjust.works 3 points 7 months ago

Rare Lego pieces get expensive fast. Some short googling brought up a windscreen that sells for around $190

[–] JoShmoe@lemmy.world 2 points 6 months ago

There's so many advantages to making your own. No wait time, and custom pieces. Only the connections are needed.

[–] DreadPotato@sopuli.xyz 6 points 7 months ago* (last edited 7 months ago) (1 children)

The tolerance on a lego brick is +-0.005mm. you're going to have a hard time achieving that on any FDM printer, even commercial ones.

[–] ShepherdPie@midwest.social 2 points 7 months ago

This is why you can attach a brick made in 1988 to one made in 2024.

[–] lucullus@discuss.tchncs.de 3 points 7 months ago

I've previously printed custom lego pieces for the Lego League kids, that my wife has at work. I'm using a Creality Ender 3 S1 with 0.4mm nozzle. Though I've not tried smaller parts. They were 8x2 units and 2 or 3 units high. They have the name of the kid on the side. It took some tries to get the tolerances good enough, but now I can print them with normal speed and minimal post processing.

So I think it depends on what pieces you want to print.

[–] Muffi@programming.dev 3 points 7 months ago (1 children)

I've printed usable pieces on my Prusa Mini with the highest detail settings. Far from perfect, but definitely usable.

If you haven't heard of it before, LeoCAD is pretty cool for modelling with LEGO.

[–] JoShmoe@lemmy.world 1 points 6 months ago

Yeah I haven't heard of it. Thanks for the info. Not sure if that would solve my problem though.

[–] NickKnight@lemmy.world 2 points 7 months ago

You can't slow down the head in specific spots but you can slow it down in general as well as setting a minimal layer time so that it pauses between layer and lets them cool.