Review of Two Trees's Sapphire Plus Core XY 3D printer

I've decided to buy this 3D printer because it looked strong and solid and well designed. I'm not going to copy all the caracteristics for this printer here, as you'll probably find a lot more on the original manufacturer website.

You'll find below my honest review that isn't influenced by anyone but my own experience with this printer.

A new kit in town

This printer is delivered as a kit you must assemble yourself. They provide a manual printed in glossy paper, but without good instructions (pictures are too small to see the important details and they skip difficult part because, well, it's difficult to explain well). Once assembled (see my other posts for few advices to help you build the printer), it's very strong and clean.

They have managed to provide a really prosumer product within a budget. Unfortunately, building the printer takes a lot of time, even more if you are a bit maniac (like me).

There are many details missing in the manual that you might have to unscrew everything at step 9 to resume at step 2. You'll probably make mistakes, so to save you some time, please follow my other post for the mistakes to avoid.

There are many reviews of this printer online, and some are very good like this one from 3dprintbeginner, so I won't repeat his points.

The good things

The frame is very strong and clean. Once built, you have minimal wire going out so it does not look like a prototype. Large build area with maximized space

The stupid things

The wire are way too long and very badly though. It'll take you half an hour to fit them in the wire holder and you'll have to deal with sliding them into the cable trays in the chassis. If you need to change something later on (like the hotend or adding a BLTouch sensor), you'll end up having to cut and solder additional wire (up to 1 meters missing).

Why did they use this path:

And not this path?

It would have:

1. Shortened wires by at least half a meter
2. Freed a side of the printer cube (you already have the power cord on one side, so moving the wire on the same side will free the back side of the cube)
3. Make maintaining easier (since you can now tilt the printer on its back to work on its electronic boards)
4. Simplified the mess in the chassis with shorter wires and removing 2 cable trays
5. Similarly, the extruder should have been mounted on the same side to free the remaining left side.

I've reworked this to a more logical system here with a detachable hotend.

Also the filament spool holder is square. When the extruder is pulling the filament, we see the spool jumping from back to forth because it does not roll correctly on a flat surface, causing a lot more tension than required (and wasting a lot of force on the extruder). So print a round spool holder as soon as possible to avoid breaking/exhausting your extruder early.

My conclusions:

1. I did not have clogged print yet, so for me, the hotend is not that bad. In all cases, you should update the hotend to print other materials so you can better cool them, so it's an upgrade you'll make someday.
2. The included PLA in the box is awful. It does manage to print well but it's very brittle and breaks if not rewind after each print.
3. The included firmware is really bad and limited. Hopefully, there are many alternative (see my upgrade post)
4. Belt tensionning is troublesome on this machine since the two belt can't be really parallel (unless you fix it, see my upgrade post), so you can't really print as well in the bed corner as you can on the center.
5. Print quality is impressive. Really, really impressive, even at 80mm/s. I have an Ultimaker at work, and this printer beats its output in all category for a tenth of the price.
6. Shipment is very important and if you live in a country with angry postmen, you must light up a candle for it to arrive correctly (the box is heavy so this doesn't help). I've received mine with a bent lead screw rod.