While the r2 is still in beta, I’m looking for parts which have best price/quality relation. There are many chinese bearings, pulleys and other parts, with very low prices but mostly those are unusable.
From the cheapest LM8UU only 30-50% of them are good enough to use them. The rest have so big looseness, which make the positioning of nozzle to be just a random, and it has very big impact on print quality. Currently I’ve ordered few bearings made by chinese brand FUSHI, those have very good opinions on Aliexpress, and I believe those will be good, without exceptions.
Almost all of the cheap chinese pulleys are just crap. The internal bore, which should be 5mm, are always 5.1mm or even more. They will rotate, but those will be always non-linear on the 5mm motor shaft. It will make the dimensions of printed objects a little bit inaccurate, and as well it will have a impact on print quality. From pulleys on Aliexpress I found good reviews of those made by POWGE, and currently I’m also waiting for them. From many cheapest ones, there is none accurate enough to be used in the printer.
Fortunately, even the cheapest Arduino + RAMPS boards are fine. But apart for that, I found that chinese brand RobotDyn are making great quality electronics, all the solders are made excellent. I strongly recommend to get those. There is one disadvantage – their Mega 2560 has a usb-micro port instead of the classig big usb-b port, but probably everyone has at least one this type of cable, as its commonly used in mobile phones.
Apart from chinese parts
The bill of materials (available on github) are constantly updated, I’ve added links to the needed products, to find them more easily.
I decided to modify the Marlin again, the added options which are worth mentioning are calibration menu and instant xyze moves from lcd. The full changelog and the source code as well are available on github.
I’m waiting to get all the (better quality) chinese parts ASAP, to finally publish the build as – at least – Realase Candidate 🙂