Geeetech A20 Single Extruder 3D Printer, with Modularized Extruder Wire Design, Filament Detector and Break-resuming Function, Large Printing Volume 250×250×250mm, Quick Assembly 3D Printers

After a lot of research (reading reviews and watching many hours of YouTube Videos), I decided to purchase this Geeetech A20 3D printer.In short, after 2 weeks of constant use, I am extremely happy with this purchase.I currently own a Robo3d R1 Plus 3D printer that I have had for the past 3 years. It was getting worn down and I was getting tired of constantly fixing it and having to remove the hot-end to fix the constant clogs.Before my A20 arrived (2 days shipping), I was prepared to have to make a lot of adjustments and fixes to tune and optimize this printer. However, to my delight, it has worked flawlessly right out of the box! Without any tweaks or adjustments, I have successfully printed with PLA and flexible TPU filament.All prints have come out perfect! The PLA models are smooth and precise. Although the specs of the Robo3D R1 Plus and the Geeetech A20 are similar (e.g. max speed, nozzle size, 1 micron resolution, etc), the prints from the A20 are far superior.Also, I was pleasantly surprised that I have had no troubles printing flexible TPU filament. All I had to do was slow down the speed and turn off retraction.Prior to my decision, I was considering the Crealty Ender 3, Crealty Ender 3 Pro, Geeetech A10, A10M, and A20M models.Although the Ender 3 and 3 Pro had very good reviews and a huge owners base, I decided to pass because the microntroller boards were very limited in what you could upgrade and modify (very limited memory space). Sure, there are workarounds, but I did not like the idea of having to go through all that trouble with the current limitations.The Geeetech A10 is essentially the same as the Ender 3 but with a few advantages. The A10 has a slightly larger build volume, a more expandable microcontroller, can be upgraded to an auto-leveling bed sensor, filament run-out sensor, and the Marlin firmware is easily upgradable without any hassles.However, I decided that I wanted a larger build volume so I looked at the Geeetech A20M. The A20M printer has a 255 by 255 by 255 volume. It also comes with a built-in filament run-out sensor and can be easily upgraded to the auto bed leveling feature.(the auto bed leveling brackets and electrical connections and wiring are already installed). Most of all, this is a dual mixing printer. This printer allows two color filaments to be printed (mixing/blending or one at a time).After reading some reviews and watching many videos, this dual hot-end feature seems really cool and unique.However, I read that many people have been having trouble keeping the dual hot-end from clogging. It seems that if you only primarily print one color, you will have trouble with clogging with this dual hot-end.So, I decided that the dual mixing color while a very cool feature, is not essential and I would rather not have to worry and fuss over clogging when I want to print.Remember, that is why a needed to buy a new printer, my Robo3d started to constantly clog. Also, for practical prints, I really only need a single color. I don’t print artistic prints that need blended colors or two colors. All my parts are functional (although I own a lot of different filament colors).If you don't have a lot of experience with 3D printers, trust me, you will get so annoyed and frustrated by clogging and hot-end issues. Lately, I was spending more time fixing the clogs on my previous printer then printing actual parts.I essentially weighed the "cool factor" of dual colors vs. reliability of printing.So, that led me to choosing the Geeetech A20 instead of the dual A20M. The A20 is the exactly the same as the A20M but has only a single hot end. I was thinking that I would have all the advantages of the A20M (large build area, advanced features, expandability, etc.) without the worry of hot-end clogging due to the special dual head hot-end.Also, for $100, I can purchase a kit to upgrade to the dual A20M if I ever decided I really wanted to print mixed colors.In summary, I am extremely happy with this purchase. The printer works flawlessly out of the box without any tweaking. It is fast and produces beautiful prints.Although, the Geeetech user base is tiny compared to the Crealty Ender 3 base, there is a very active Geeetech user group on Facebook.Also, many of the hints and "upgrades" that apply to the Ender printers apply to the Geeetech printers since the builds are so similar.