lemme explain

WAIT! its my problem, I never wrote down a complete summary of why I'm getting amazon and not AliExpress etc.

REASON 1

I have Amazon prime, enabling me to get FREE SHIPPING on ALL orders!

REASON 2

because of import tariffs from China in the USA $$$

REASON 3

My dad doesn't like AliExpress, due to it's Chinese nature, and his cyber-security sensitive job. I just can't use it.

Please consider the above and look at the snippet from the notes and slack below.

for me, it ends up cheapest to buy parts off of amazon, because I have prime and can get free shipping, reference https://hackclub.slack.com/archives/C09CMJV6V6K/p1763603033790629.

REASON 4

this is the second to worst reason.
When ordering off AliExpress, there seems to be no quality control, verified authentic reviews, guaranteed product contents, etc. using Amazon allows for assurance of getting the stuff.

REASON 5

Worst reason, only includer here because it was part of my thought, you can ignore it.
AliExpress's prices are only a few cents/dollars cheaper than Amazon, and I would still need to request 400$, I would just need to pay less out of pocket. BUT, I am wiling (and even need to) pay a bit more myself for all of the above reasons.
but you can ignore that ^^^

I especially hope that you will take the family reason into consideration, as well as all of the above.
Thank you for all of your feedback and let me know if there are any problems that arise.

fixed that

Thanks Jay for the feedback!
So I'm not going to remove the filament from the bom, as it is a required aspect of the printer, however, I can remove it from the cart of the amazon order and fix the BOM to include a note about it being bought by myself.

G' morning reviewers

Hey guys! I'd be great if you read the notes that I put in for you! If the system is broken, here they are now

If there is any problem just let me know!
Unfortunately this does not meet the hour recommendation for tier 1, and I have seen projects rejected because of this, I had a lot of help throughout the project, so it went faster than expected. I also forgot to log some time but whatever. I am only requesting $400, the tier's amount, because I plan to pay some out of pocket. for me, it ends up cheapest to buy parts off of amazon, because I have prime and can get free shipping, reference https://hackclub.slack.com/archives/C09CMJV6V6K/p1763603033790629.
If you don't want the grant money spent on certain items, just dm me and I can pay for them myself. remember that this is a submission for review of the design!

I, also, am unfortunately unable to provide a video of it not working, because I haven't built it yet. Note the button.
I am not yet in the build process, I am asking for money to build it. Nor can I be more descriptive in the build process, I haven't built it.

If you read the notes (above), you will see my saying

I am only requesting $400, the tier's amount, because I plan to pay some out of pocket.

this means that I only want $400

Anyway thank you for your time, If there is any >real< problem please let me know!

revised

No problem, thanks for the feedback! I've fixed the README and the cart screenshot. Unfortunately I'm not rich, and need this grant to buy the parts to build it, making posting images of the build impossible. I have updated the repo with the order of building and instructions to follow the cad, which is what I will follow. As you request, I, after building, can update the repo with better instructions.

did the repo

I put everything into the repo and set it up. the firmware provided extra trouble, because it was provided in a different repo. I also got everything ready to submit.

DONE!

I changed out the bed for an ender 3 bed, because it is cheaper. I also finalized the BOM, ($610.25 or something) which entails my paying out of pocket for some stuff.
I also made a simple box to hold the electronics
I'm now going to make the repo

ug.

ok so I got some more stuff into the cad, like boards etc. A benchy also found its way in. The BOM has also come closer to being done, with everything but the heatbed. problem: it costs $549.95, so I will need to optimize some more, I don't want to have to pay more than $100 myself.

got it nearly done

So in this block I (spread over like 2 weeks) managed to get the cad mostly done. things mates, bad parts etc. The BOM also took a large amount of this time, trying to find all of the required parts. It unfortunately went over $400 so I will need to pay some myself. Whatever.

DID A LOT OF STUFF (that took surprisingly little time)

In this 6 hour block (spread across multiple days) I made a bunch of improvements to the cad.
One of the first things I did was to add a filament spool holder to the side of the printer to hold 1kg of filament on it.

I also constructed a port for the ptfe tubing in the hotend.

(If you haven't realized by now, it will be bowden (yuck) because it is cheaper.)

I also put an ender 3 extruder into the printer because it is cheaper than anything else that I could buy or make.

made the hotend look nice and connected it to the belts

I made a nice looking(ish) cover for the hotend and made it able to connect to the core xy. Now it looks symmetrical and more worth 300-400 dollars. I attempted to make some decorative covers for the printer but that didn't work.

Did a little bit of everything

In this 2 hour block I put a fan and bl touch on the hotend and figured out how to make the fan duct. both parts were added to the BOM. I also added more structural brackets. I also decided to change to nema 17 48mm steppers because they were cheaper for not much torque loss. Also the tensioners were removed and will be replaced elsewhere.

worked on cad

oops, I need to make better journals.
So anyway, this time, while slack was down, I got to work just making the cad work. I added some more structural brackets and fixed the feet. There were some extrusions that measured 455mm, so I shrank them to be 450mm long, to be cheaper.I also had to touch up the belts because of this.
I removed the tensioner and will be moving it to elsewhere.
I decided on a bambu hotend.

fixed the cad which had gotten really broken

So apparently changing out the extrusions really messed up the cad. so I had to spend 5 hours fixing the dimensions, alignment, 3d printable parts, etc. the z rails proved especially difficult.

worked on cad

did a lot of cad.
I switched out all of the 415mm extrusion for 400mm extrusion.
most all of the 3d prints got changed because of this.
I did some more research into parts and apparently it is cheaper on Amazon than AliExpress.
I also worked to optimize the BOM.
this was over a few days

BOM

fixed some floating belts in the cad.
worked on the BOM, it is still incomplete and requires more work.
It will still be a lot of work until it is ready though

met with a 3d printer expert

Was at orlando maker faire and met someone who makes delta printers (https://www.deltamaker.com/)
and spoke with them about how different very large printers worked.

worked on finding out the extruder/ hotend

worked to find an extruder and hotend.
decided on direct drive and a high flow nozzle.
also decided to run klipper on it. so that will require a raspberry pi.

More cad

I replaced the 2020 extrusions with 2040 extrusions.
I also reworked the mates
also I researched different extruder and heatbed options, many of which are too expensive, so i will have to find something cheaper.

did a whole ton of cad

I cadded the frame, coreXY, and Z axis. I decided to use a combination of linear rods and linear rails for precision in the coreXY and cheapness in the z.
I worked more on what parts I want in including the motors (nema 17 60mm).
the belt tensioner was especially fun to cad.
will work on mates next

met with Tacomakes3D

I met with Tacomakes3D to find out how this project should be done
through his guidance i was able to better define what i wanted this to be like
he also helped me with deciding how it should work

made mockup

figured out how coreXY worked with a mockup of the mechanism.
Researched parts to find how it would work for a reasonable price
decided that I wanted auto bed leveling and calibration

decided what it will be like

I've decided to make a 3d printer
I want it to be coreXY with a relatively large build volume
for less than $350
I also want it to be somewhat fast but it must be precise too.