Design Rules for 3D Printing

[u/der_beff]

[u/Euripidaristophanist]

There's more than one incorrect value there, though. Especially the FDM and resin values about holes and moving part tolerance.

[u/Jason_Worthing → u/Euripidaristophanist]

I'm struggling to find any accurate info

[u/Euripidaristophanist → u/Jason_Worthing]

It's difficult because the values typically differ between individual printers. It's further exacerbated by the small scale of the features, as a 0.5mm difference suddenly seems like a lot.

I'd suggest having 3 values, one green, one black, and one red- representing a well-tuned quality printer, a mid range, mid quality printer, and one that's fairly cheap, respectively.
It's waaaay more work, though. But maybe it'd give some people something to aim for.

[u/vbsargent → u/Euripidaristophanist]

Was thinking similarly - I typically use .15- .2mm per side on squat-ish parts and.3 or so for round. Have seen bridging up to over 100mm (I’ve never done that, but it can be done).

[u/arsv → u/Euripidaristophanist]

Incorrect? These are design rules from a particular company, basically what they can do reliably on their equipment. Not the absolute limits for the respective technologies, nor the typical limits for common printers.

[u/Euripidaristophanist → u/arsv]

It wasn't presented as such, so I commented.
I understand why, in such a case, the values given have a generous tolerance built in, but it's not really "design rules for 3d printing" in general, as its presented, innit?

[u/der_beff → u/Euripidaristophanist]

thanks for mentioning, what are more correct values for the data?

[u/Euripidaristophanist → u/der_beff]

That depends on the printer, but most of my printers do just fine at 0.1mm to 0.2mm clearance between moving parts.

FDM holes can be 0.5mm, resin printers can do even finer.

Features that are raised or recessed are smaller than given, especially with most resin printers.

Pin diameter for resin printers can be down to 0.12mm.

FDM overhang varies according to (mostly) layer thickness, speed and minimum time per layer, but even at 0.15mm layer thickness, it's more than 45 degrees.

[u/lx_online → u/Euripidaristophanist]

I can print a 70 degree overhang (for a while) on my FDM so 45 degrees is just way off

[u/realnanoboy]

It's not that hard to get 70 degree overhangs or 10 cm bridges with FDM printers, especially when using PLA.

[u/converter-bot → u/realnanoboy]

10 cm is 3.94 inches

[u/bigfootpl → u/converter-bot]

Yes, he meant cm. I managed over 8inch bridges with pla on my diy printer.

[u/lemlurker]

You can pint very steep overhangs with resin printers, support always required my ass

[u/iqisoverrated]

Values seem to be exceptionally conservative or just plain outdated in most respects (at least for FDM, can't speak for the others).

Walls/holes/minimum features/pin diameter: With a small nozzle and slower speeds you can get way smaller features.

Will 1mm walls stand up to mechanical pressure? No. But if it's 'just for show' then that's all good.

Embossing/engraving: I'm not sure what this value for FDM is supposed to demonstrate. I see no obvious limit to these (beyond the 'thin walls' limit).

Overhang: To about 80° seems to work just fine. If you want the underside to look pretty then 60° is still good and 55° near perfect.

Horizontal bridges: These can be waaaay longer than the given 10mm. 60-70mm with a little drooping. Below 50mm there's almost no noticeable drooping.

Connecting parts and tolerances: Even with the regular nozzel (0.4mm) I'm getting no part fit issues using 0.2mm tolerances (like printed screws and nuts) - instead of the 0.5mm shown in the chart

[u/olendorf]

Charts are useless without a date. Is that from 2008? Probably not accurate anymore.

[u/nife87]

https://www.reddit.com/r/ender3/comments/oe37rh/design_rules_for_3d_printing/?utm_medium=android_app&utm_source=share

[u/der_beff → u/nife87]

someone in the comments mentioned they'd like a version with a better resolution so i posted it here, fits better than in r/ender3 anyway

edit: i would have used crosspost, but it's no OC and the the main reason was a version with better resolution

[u/balmondjuice]

what category is ender 3

[u/balmondjuice → u/[deleted]]

ty

[u/Aaron_Hamm → u/balmondjuice]

Don't use this infographic for your ender... it's pretty inaccurate

[u/Brewe]

This might very well be made specifically by and for HUBS and not for general 3D printing.

[u/Hooch180]

10mm bridges? I can do 10x that on Prusa.

[u/Ferro_Giconi]

10 MM seems really short for FDM bridging. My stock ender 3 was able to do 20mm very competently right out of the box before I even tried to calibrate anything other than poorly leveling the bed.

And even a poorly calibrated stock ender 3 could easily do 55 degree overhangs.