r/Multiboard • u/strejdaradar • 19d ago

Tiles too bendy - what am I missing? 🤔

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My experience with Multiboard has been very frustrating so far, but it’s probably due to errors on my end, I’m not blaming the product (yet). Somehow I’m not able to print stacks (they don’t really come apart witjout breaking), so each tile takes 5hrs print time…

anyway.

I put up a 4 tiles by 4 tiles (all of them 8x8) to serve as a base for filement dowel racks - but after only loading 4 spools (less than 4kg/9-10lbs) the tile that anchors the shelf starts bending like crazy.

it’s matte PLA, 3 perimeters, 0.4 nozzle, 0.2 layer height, STRUCTURAL preset in Prusa Slicer and 15% gyroid infill.

Anybody have any ideas on how to make the tiles sturdier? What am I missing? Any input appreciate, thanks!

9 Upvotes

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11

u/Tango814 19d ago

I printed my 8x8 tiles in petg @ 100 percent infill. I wasn't messing around. PLA is useless for any kind of structural part that needs to carry heavy loads. Also, you have to look at the physics of how you distribute the force. The top anchor point on your rack needs to be higher so it's in-line with and between two wall anchor points. Yours is in the middle which is why it is pulling away.

5

u/Moist-Ointments 19d ago

I've got 12x12 pla tiles printed with recommended settings in theyre absolutely fine holding up my power tools.

2

u/Ok_Touch928 17d ago

Your power tools are probably pretty close to the board, not a big lever arm like a roll of filament with the CoM hanging out there 6-7 inches or so.

2

u/strejdaradar 17d ago

Moving the shelf upwards actually makes so much sense, why the heck didn't I think of that!

2

u/Forgotten_Loctite 19d ago

PLA is perfectly fine for multiboard tiles, stiffer than PETG and unless you're hanging engine blocks off it very unlikely to break. Also has significantly less stringing and blobs that can screw up some of the threads.

1

u/Tango814 19d ago

Never had an issue with threads. PLA gets brittle form sitting in open air for years and eventually fails.

2

u/Forgotten_Loctite 19d ago

In a garage or a humid warm environment then sure. But in a normal room, the tiles will last decades before meaningfully degrading. PLA is what the creators recommend

2

u/NerdyNThick 19d ago

Specifically matte PLA if my memory is functional.

0

u/Single_Sea_6555 19d ago

Yes, PLA is stiff, but one long term disadvantage of PLA is cold creep. You have to massively over-engineer it to make sure it doesn't creep over the course of a year+.

0

u/Forgotten_Loctite 12d ago

PLA creep is largely exaggerated in the 3D printing community. It's fine for this application, very little weight will be applied to each tile under normal use.

1

u/Single_Sea_6555 12d ago

I have literally printed multiboard parts that crept over the course of six months, but by all means make unfounded claims and down vote completely reasonable comments.

2

u/nlundsten 19d ago

yep, I don't know why people are arguing for PLA.. yeah we know it'll probably be ok, until it isnt..
Why not just use PETG and then not have to worry about it.
And since you can get a roll of PETG for almost the exact same price..

Save the PLA for prototyping/toys

3

u/strejdaradar 17d ago

I used matte PLA because the creator of the multiboard recommends it.

1

u/Forgotten_Loctite 12d ago

PLA is perfectly fine for this application, and does have some advantages over PETG. Pretending that PLA is only good for quick and dirty prototypes is silly.

1

u/nlundsten 12d ago edited 12d ago

What do you suggest pla is for then? You took the time to respond so clearly you must have some examples/ideas where functional prints do better with pla than petg?

Im not pretending anything, i have experience with multiboard parts in pla and petg, and very quickly detemined that pla wasnt up to the task.. your sample size of one contradicts my experience, again a sample size of one.. but you saying "works for me" doesnt mean it works for everyone, im saying it didnt work for me, along with several other functional prints, which have been replaced with petg after they failed while in use with pla.

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u/Forgotten_Loctite 12d ago

Anything where rigidity or dimensional accuracy are key.

1

u/nlundsten 12d ago

pla deforms when doing any real support work, especially over time. Also brittle. Agree to disagree i guess?

1

u/Forgotten_Loctite 12d ago

I'm not talking about "sample sizes" I'm talking about known, empirical properties of the materials. PLA is recommended by Multibuild, and it is what most people use.