I got this machine in Open Box for 250 dollars. Which is an amazing price for what you get. It is a solidly built machine. It works right out of the box. I did have to do some tweaking and lower the bed plate because the nozzle was dragging against the nozzle and making a loud grinding noise and my screw inside the knob wouldnt come out so that i could put the knob on but other than those 2 things the printer works well. It makes some beautiful prints and I would recommend this to others if they are looking for a good machine that just works. Just take some time to level the bed correctly so it isnt hitting the nozzle when it moves.

It came without the holder for the filament... but since it was an open box purchase I won't hold that factor into the rating. What really bothers me is that I haven't been able to manage to produce a single 3D print yet... I have tried many many times and different filaments and this things moves, makes all kind of different noises (not too noisy fortunately) but the plastic only seems to flow sometimes... other times the nozzle simply moves and moves without any plastic coming out the nozzle.

I understand it's a open box but I did have a few problems. I called support and they helped a lot with the problems. Over pleased with the product. Wish it came with at least a 30 day warranty.

I've used this printer with both PLA and PETG and everything has turned out great. There were three problems with the printer initially. First, the PLA shipped with the printer had been opened and was in very bad shape, with lots of fracturing. This meant that I had to open up the extruder in several places to clean it out, which is when I discovered the second problem: that one of the tiny 1.5mm hex screws had been stripped. I used a rotary tool with a tiny diamond drill tip to cut a groove into its head, extracted it with a small Phillips extractor, and replaced all of the screws on the plate with higher quality ones that I bought at the local hardware store. (I also ordered better PLA and PETG.) The third problem is that the instructions are pretty useless, seemingly being outdated. The CURA software wasn't downloadable but on the SD card and the software had different choices for setup than the manual indicated. The instructions for inserting new filament were just plain wrong. All that being said, once the problems were fixed, new PLA acquired, and the bed leveled, this printer has been absolutely flawless. I tested both PLA and PETG with a bust of Lincoln which turned out perfect, even scaled down to 3cm. I relied on the community to give pointers about temperatures, and that data worked the first time.

I bought an open box Maker Ultimate for a good price. It was clear after about 5 hours of use that the cooling fans already had issues (both the motherboard fan and extruder fan. These fans are very cheap to replace (though it voids the warranty). Print quality is very good and the device itself is good for beginners to experienced users. Leveling is easy (just grab a 1mm feeler gauge) and you'll be up and running quickly. Overall a very good machine. with some upgrades needed for some easily replaceable components.

Extremely finicky - not having an auto leveling bed is awful

It doesn't work out of the box, ' error stopped temp sensor'. I can't fix it, Monoprice's system says I missed the return window by a few days (it was a Xmas present so it didn't get opened until then) and can't return it. I feel completely robbed by this hunk of junk.

This is a robust printer for the money. It is actually the Wanho Duplicator 6.

The printer works out of the box and produces decent models as long as the details aren't too fine. When printing on the highest resolution with the default settings the quality of the output goes down.

I am still tweaking Cura to produce the best possible prints.

The documentation is nearly non-existant and the firmware was last updated in 2016.

A full users and maintenance manual would be very nice.

Plexiglass sides and a top are available from another vendor but are prohibitively expensive.

I was unable to get the printer to print reliably via USB.

This printer does not have WiFi either so I am printing from memory card.

Bed leveling is extremely easy taking about 5 minutes using the built in step by step procedure.

If you have the money, buy the Prusa, if not this is a great deal for the money.

I love this printer, bought one for work and loved it so much I bought one for home. The sturdy metal frame makes a world of difference, and the build-plate only moves up/down and so remains calibrated for longer. Everything about this feels rock-solid. The few things that aren’t 100/100 are easily remedied by printing the upgrades yourself! But even stock, this printer outperforms modified machines twice its price. You literally CANNOT go wrong with this printer.

(Full disclosure, I bought my Monoprice Ulitmate 3D as an OpenBox direct from Monoprice. They were very up front about the fact that some items might be missing and the the aesthetics might not be perfect. My rating is based on the actual printer and does not reflect anything having to do with it being open box.)That said here we go:
Shipping & Packaging - Mine came repacked in a box that was obviously not the original and a little over sized. There was great foam packing in place around the unit, but not on the interior. As a result, the little bag of parts and pieces had opened and everything got flung around inside the printer. Nothing seemed to be damaged though.

Out of the box, I noticed I was missing a few things - a power cord and any kind of setup instructions were the most notable. I did have sample filament, some PTFE tuning, a few screws, hex wrenches, a replacement surface for the build plate, the parts for the filament holder, and full size SD card (THANK YOU!). I can't say if i was supposed to have anything else because there was no guide or packing list. The frame and internal components are rock solid. I checked for loose screws (because I saw that in a video) and all were tight. Fortunately the power cord is a standard kind PC's use, so I had plenty and was able to power it on.

First use: The bed leveling is a little funky because you only level with three points - the front middle using the dial, and back left and right using knobs under the build plate. After running a few unsuccessful test cubes, I found that I needed to manually tighten the front screw a bit to compress that spring. Leveling after that worked fine. I really like the automatic filament loading and unloading (though it could go a little faster). I was still getting not-so-perfect prints, but after printing one of the samples on the SD card and it coming out great, I blamed Cura. After some tweaking I got good prints by slowing down to 50mm/sec.

After a month of printing: The stock part fan shroud is awful (as noted in many a review) and I had to print a different one. Still getting decent (not great) prints. To be clear the quality is what I'd expect from a $400 printer not a $4000 printer and I'm sure with more tweaking in Cura I could do better. I have had a problem trying to print anything but PLA. At higher temps (220+) the printer throws a heat sensor error and locks down (so no PETG or ABS). The control board fan under the printer has started to whine and grind when I turn the printer on until it gets up to speed (submitting as a warranty claim). I had to add a short piece of PTFE where the filament goes into the extruder. I had noticed that as filament was fed, it was cutting a slot into the plastic cover of the extruder housing.

Overall, I like the printer. It think it would be a great starter printer. It is simple to learn and use and it's consistent enough for me. If I didn't have the temp issue, I'd give it 4 stars.