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?

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

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3 points

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

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8 points

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

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1 point

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.

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2 points

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!

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25 points

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.

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4 points

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

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2 points

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.

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3 points

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.

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1 point

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

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6 points
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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.

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2 points

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

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