3DPrinting

This is good advice.

On the bright side for OP, his part should (hopefully) only come into contact with dry coffee grounds so some of those concerns are lessened.

In other applications -- sealant or not -- I can only imagine pouring hot coffee over a PLA part would not be a recipe for success...

Honestly, instead of all that, the general rule should be don't use 3d printed stuff with food, period. Cause everyones focused on what can leech into the plastic and cause nastiness, but no one focuses about what could leech out of the plastic. Especially in this era where every month theres some new recall of some product that has something terrible in it that shouldnt be there.

and even if you do manage to find and buy a filament that claims its food safe/food grade, your printer is not. The materials used in 3d printers are not food safe, the lubricants and greases are not food safe, the previous filaments that you've printed with and have left buildup isnt food safe, and theres probably a lot in the average printers hot end that is not food safe.. Not to mention the bed, and any adhesives you might use.

Its just not worth the risk to yourself or potential loved ones, So don't even try it in all honesty.

3d printers are great, fantastic even. Mines saved a lot of money by letting me design and build replacement parts and tools to do obscure jobs specific to the situation, and even some pretty nice gifts and other stuff. Its great at a lot of things.

but it will never be good for anything to do with human consumption. Don't let 3d printed materials touch your food, drinks, or be involved in prep areas.

He could just run a flame on it to melt whispy plastic strands down

In general, yes. But the contact here is minimal. I wouldn't be worried.

3d printing vs injection molding is a huge difference, so it's not fair to say "they are both made of plastic".

Yeah you need moisture for decay. Tiny fines might eventually go rancid in tiny pores and taste or smell a little bad but idk. She'll be right.

Like it's not like I clean the burrs that grind the beans much so if rotting was a problem I'd be dead already.

I use some supposedly food grade filament with a stainless nozzle and dedicated extruder, and after initial finishing they get a dip in food grade epoxy. I only made star wars and penis shaped cookie cutters though.

Huh, didn't consider aliexpress. I have an old lever machine with a non standard basket size (49 mm or something) so idk if they exist for it. I can see one with a brief search, but it protrudes down into the basket to locate itself which is a bit inelegant.

I haven't done much with magnets, but I saw one model where you pause the print halfway through, drop magnets into the holes, then continue the print and they get sealed in Amontillado-style.

I'm not really a coffee wanker so I don't know one way or the other what tamping halfway would do. I just want to be able to dump the grounds in, shake, and tamp.

The magnets are just push fit into little holes in the bottom. I just tap them in with blunt nail and a hammer.

Yeah but yours isn't made of plastic so I think we can both find things to be pleased about.

Thanks for the kind words!

Hot a air station, if you have one, will also do wonders here. I suspect an adjustable hot air gun would also probably work, but those things can put out some serious heat so be careful.

I have a non standard old timey portafilter.

Pet peeve, a coffee machine isn't an investment. Not in the literal sense and the creepy corporatisation of language is weird. It's just an expensive toy that makes me like life a little more :) I actually got an old europiccola because no electronics (bimetal strip and heating coil aside) means I can keep this thing working indefinitely.