Mods to make a Monoprice Maker Select V2 Work Properly

The Monoprice Maker Select V2 (A Wanhao Duplicator i3 clone) is a printer that comes with a Melzi mainboard that is seemingly designed to die 💀 and try to take your house down with it in flames🔥 but before that it will make some mediocre prints while the Z-axis wobbles about and the hotend never prints at the advertised speeds.

When I bought this printer (March 2018) it seemed like a good deal as I was able to find it refurbished at a discount ($199.99 at the time) and it was even recommended by making it look like a good buy.

Since then I have learned a LOT about 3D Printing the hard way and also learned that this printer is a dumpster fire 🗑️🔥. Today there are much better printers you can buy that work decently out of the box and thankfully you can’t buy this printer anymore but if you find one that someone is getting rid of and you’re feeling like you want to take a deep dive into modifying a printer here’s some upgrades I’ve made over the years to make this printer work properly.

A word of caution: these mods will require experience with soldering electronics, crimping JST and Dupont connectors, working with 120V lines on the input, and compiling a custom Marlin printer Firmware but there are tons of Youtube videos to get you going on these subjects. Teching Tech is a great place to start: Additionally if you make the same exact mods listed here you can reach out to me for a custom Marlin firmware config file to get you started. Last but not least with this printer make sure you double check every bolt and set screw. When mine arrived it was supposed to be ready to go out of the box and embarrassingly it was over a year later when I realized some badly set screws were causing layer shifts (among other things).

BIGTREETECH SKR Mini E3 V3.0 Control Board + TFT35 E3 V3 Touch Screen

BTT TFT35-E3 V3.0 – Free Standing Case Print

JST & Dupont Connector and Crimp Kit (for proper rewiring)

eTopxizu 12v 30a Power Supply
(No more flickering LED lights when printing)

Bigtreetech Dual Gear Extruder

Bowden Extruder Mount Print for Dual Gear Extruder
(only used Step_motor_holder_frame_v.1.1.stl & Step_motor_clamp_v1.0.stl)

Spool Riser Print

NeoPixel Lighting

This one doesn’t affect print quality but it is fun and allows you to light up the work space for remote viewing from a webcam

120mm Fan Grill Print

Wanhao Duplicator i3 120mm PSU Cover

Spring Cups

e3D V6 Bowden mount for Wanhao Duplicator i3 Plus

Bed Level Thumb Wheel M3 Nut

DiiiCooler for Wanhao Duplicator i3 / Maker Select

[Gulfcoast Robotics] Z-Brace Frame Support Kit for Wanhao Duplicator i3 and Maker Select V1, V2 and V2.1 3D Printers

Borosilicate Glass Plate

E3D V6 Hotend Kit


  1. Kevin Althans

    Hey there. Have exactly the same Wanhao/SKR setup and looking to get the Marlin build correct. Need some help if you’re willing to share your firmware.

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