MK4S KIT High-Speed DIY 3D Printer – Self-Assembly FDM Printer Kit with Input Shaping, Automatic Calibration & Open-Source Upgradeable Design

Great to build and use for kids, can be assembled in a day with a lot of fun. Works fine right after assembling. Different brands of PETG and PLA filament from Prusa, Bambu Lab, and Esun print well even with generic profiles, while extrusion multiplier and bed temperature tuning according to ambient humidity and temperature are beneficial for accuracy to print miniatures. Very durable build and can be moved by the top of the frame. Surprisingly quiet even for a live room. Part cooling is fantastic while still very silent. Prusa Slicer integration (i.e. Prusa Connect) and iOS/Android mobile app with cloud slicer (i.e. EasyPrint) just work too. And it actually costs about the same as a cheap Chinese 3D printer like the Ender 2 v2 with a replaced extruder, powerful full-metal hotend, linear rails, quality Z axes, a custom cooling system, RPI Zero W2 with Klipper, etc.

This is simply the best open designn 3D printer available. When purchased as a kit it gives you the opportunity to understand how the system is designed and how to best tune and adjust it over time. There are lower cost 3D printers, but their accuracy and consistency will not match this printer. If you do not take your time and you rush through the assembly of the kit, you would probably be better off buying the fully assembled printer. The more careful and meticulous you are in the assembly, the better the performance of the finished printer will be. There is a wonderful set of videos available online in addition to the printed instructions. I would strongly recommend using the videos to complement the printed instructions. The printer is packaged securely in it's shipping box and has everything that you will need in the box, including Prusa's inclusion of a bag of gummy bears, to serve as your reward for completing the assembly. If build quality and accuracy of printing matter to you, this is the 3D printer to choose.

Works great and buying this printer as a kit did save some money but note that I found it a challenging assembly. I have built quite a few computers but this was more difficult. At the end I wondered whether the saving was worth the frustration. Getting the tension right on drive belts takes much more fussing around than just screwing in a board or a drive. In several places some assembly required awkward reaching around the printer. The step by step directions were good and the comments inserted into the guide by other users were sometimes essential - when the wording in the online guide was not as clear as it could be. Clever idea to include such comments. I added my own when I thought I could contribute. I also used their online 24/7 chat to get help a couple of times when I could not figure out why I could not get the printer to pass a calibration test. It turned out that i had not noticed that one of bearings had slipped out of position. Only thing negative I can think of is that the power cord did not fit very well and could become loose - which would turn the printer off! Fortunately, I had a compatible cord from an old computer and it fits perfectly. I guess I could have tried filing their plug down so it would fit better but easier to just swap cables. I have now printed a number of things starting with the easy to use PLA filament. My first try with the TPU (FLEX) filament was not so good but they do warn you of possible difficulties with that kind of filament.

Building this kit is worth the time and effort. The interactive instructions on the website along with comments from other people are extremely useful. It took me 3 days to assemble it, and I didn’t break any of the delicate printed plastic parts, and I only had to sacrifice one thermal pad, and I stripped out just one screw and nut in the beginning. The kit includes many spare parts for small snafus such as these. The design uses many 3D printed parts held together with allen key screws and nuts. A bit tedious to work with but not difficult once you get the hang of it. The interactive instructions are not perfect, but that’s where the comments fill in what details may be missing. Some people report having issues with the automatic calibrations at the end, and talk about that in the comments. As I worked through my assembly, I followed the instructions, and only kept the comments in mind for later if I had calibration issues. My calibrations all passed the first time just from following the instructions, and then I started printing models I already had ready to go. I used the recommended Prusa slicer software and the default settings deliver some impressive results. I would say that the inexpensive Elegoo PLA filament that I bought with it works great!

This is a great product. I would suggest to be very patient and carefully read assembly instructions if you get the kit. The belt tuning (tension) app didn't work for me, but it's not necessary.

An absolute good buy. Took about two weeks to assemble in my spare time. Directions are great! Machine works very well, would buy again in a heartbeat. I cannot say enough positive things about the machine. Fun to assemble, fun to use and make different things for the grandkids. Also make odd ball parts for everyday living. Fun machine.

I bought this after seeing it on Amazon Prime Day, 720 after fees which i feel is a great price for this printer! I received the printer kit on July 13th at night so I didn't start assembly until the following day, the instructions are very well written and it took me about 2 days of working on it(maybe like 14 hours or so)since I was also watching Netflix. I didn't have any issues at all during assembly, it was actually pretty fun looking back at it now and I would totally do it again. The guide includes comments from other users as well and they may be helpful to you on that particular step. Just take your time and read the directions clearly and you shouldn't have any issues. After getting it assembled I printed the prusa keychain and it came out great! As of 7/22 I already have 3 days 14 hours on the printer so I am loving it! My dishwasher was missing a clip for the top dish rack and I already printed a replacement for it. Overall I am really satisfied with the printer and have already ordered the MMU3 for multicolor prints.

Why did you pick this product vs others?: I wanted a second Prusa I already own an MK3S and I love it! So why not an MK4S. Unfortunately the kit was missing the trapazoid nuts. They where not in the motor box 🙄. Anyways I reached to Amazon they suggested I ship the whole thing back and exchange it. I think thats a waste of time for Me, Amazon employees, and Prusa. I just ordered the Nuts. I will say after building this Printer WoW! night and day difference from MK3s. I will say that because this printer is Open source finding parts, it is very easy, and that's why I stick with prusa. And of course the quality 👌 😉 I give the printer it self a 5/5 I give Prusa QC 3/5 for there mistake of not including trapazoid nut. For a total score of 4/5 Update 7/21/2025 LCD died after 3 days 😪 I will contact Prusa directly Guess I will get to review support now. So product review is now 1 star.

i3 mark3sから引き続き購入しました。 まず、組み立て説明書の添付が無い。そういう仕様なのか入れ忘れなのかわからない。 前回mark3sは英語版の説明書だった。説明書が中国語を英語に翻訳したような感じだったので、 日本語版をネットで探しダウンロ－ドした。日本語もおかしかった。ネジをネジするみたいな表記だった。 今回は、日本語版を最初からネットで探して組んだ。 寸法精度が完璧で、１００分の１単位まで合わせてある様で、設計が素晴らしかった。 １０時間くらいかかったけど、あとちょっとで完成ってとこで、ネジ袋が不足してた… 特殊形状なので、代用ネジが使えず困りました。 Amazonに問い合わせたところ、ネジだけ送る事が出来ないので返品か交換と言われたが、１０時間かけて組んだものを 返品する気も無いし、そもそも返品出来ない。 仕方ないのでPRUSAから補修部品で注文しようとしたが… そもそも海外製なので、輸入になる。 輸送コストが高く１か月くらいかかりそうなので、現実的では無い。 知ってるネジ専門店に問い合わせしたところ、仕入れられそうなのでそちらでネジだけ注文しました。 キチンと正しいものが来るといいけど…←（今ここ） 海外製ですが、設計は完璧で印刷クオリティは業者さんに頼んだ物に負けないクオリティで気に入ってますが… 他の方のレビュ－にある通り、足りないものが有ったりするみたいです。 そこは外人従業員の質の問題だと思いますので仕方ない。 ３Dプリンタ－構成樹脂パ－ツの破損時は、プリントできるデータが公開されてるのは有難いですね！ 補修部品などの供給がサクッと出来る様になれば良いんですが…

Brilliant works great i got the kit version built it over 3 days on and off if you not good at reading manuals there is a step by step guild utube videos you can watch and guides you through it highly recommend this 3d printer thank you prusa

Il kit è arrivato in perfette condizioni, montaggio senza alcun problema, e prima stampa uscita perfetta. Ma è una Prusa, non avevo dubbi.

Le kit est globalement bien conçu, les instructions claires, mais ça reste beaucoup trop cher pour ce que c'est. Les plus de la mk4s : - Rapide - Fiable - Précise Les moins : - Beaucoup trop chère - Conception douteuse de certaines parties (système de tension de la courroie de l'axe Y) - Peu d'innovations par rapport aux modèles d'il y a 7-8 ans : il s'agit d'une plate-forme arrivée au bout de son cycle de vie (vs les nouveaux modèles de cette marque) Accessoirement, lors de l'achat une date de livraison été indiquée mais finalement on a essayé de me livrer la veille, ce qui n'était pas possible pour moi.

Early days and playing around with 3D printing. The building from scratch was the added bonus. Great fun and reasonably straight forward to do with the online instructional videos. With the basic shapes and printing completed it works well, neat and tidy.